New method to understand superconductors

Dec 13, 2012

Researchers at The Open University have devised a new method to understand the processes that happen when atoms cool which could lead to new materials for superconducting power grids and widespread use of magnetic resonance imaging (MRI).

In a paper, "Bilayers of as a quantum simulator for unconventional superconductors" just published in Physical Review Letters, Dr Jim Hague and Dr Calum McCormick at The Open University's Department of Physical Sciences  describe a new method to understand the cooling of atoms, which is to simulate a superconductor using a "quantum simulator" (a kind of bespoke quantum computer for examining specific problems) rather than a supercomputer.

The researchers found that just such a simulator can be built to examine atoms cooled to just a millionth of a degree above absolute zero. The atoms are controlled using which enhance the electrical forces between the atoms, which are usually weak and unimportant. These forces mimic the physics of the superconductor, and the proposed simulator includes far more physical detail than ever before.

"The problem is that up to now nobody knew how to build such a material because physics of the best superconductors are extremely difficult to understand", said Dr Hague. "By studying the atoms in the quantum simulator, we expect that it will be possible to make major progress in unravelling the underlying theory of these fascinating materials. A superconductor (a material with no electrical resistance) operating close to room temperature would offer potentially revolutionary technology."

Explore further: Scientists observe quantum superconductor-metal transition and superconducting glass

More information: Hague, J. and MacCormick, C. Bilayers of Rydberg Atoms as a Quantum Simulator for Unconventional Superconductors. APS Journals. prl.aps.org/abstract/PRL/v109/i22/e223001

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Minich
1 / 5 (2) Dec 13, 2012
"The problem is that up to now nobody knew how to build such a material because physics of the best superconductors are extremely difficult to understand"," said Dr Hague.

There is no problem at all :)
Design electronic bands with the highest pozitive Hall coefficient at fermi level and with no pseudogap at fermi level.
ValeriaT
1 / 5 (4) Dec 14, 2012
The problem is that up to now nobody knew how to build such a material because physics of the best superconductors are extremely difficult to understand
The dense aether model leads into simplification of this understanding considerably. The principle of high temperature superconductivity is in high compression of electrons between atom orbitals (type I superconductors) or between atoms in lattice (type II superconductors). When the electrons will get close each other, then their repulsive forces will overlap and compensate mutually, so that the electrons will move freely. After all, the same geometric effect is responsible for free motion of particles in the cosmic space.

The electrons are indeed too tiny for to create a pressure vessel for them, but before some time J.F.Prins revealed accidentally a better way: the electrons are attracted to the positively charged places of the lattice (the "holes") like the hungry hens to the feeder.
ValeriaT
1 / 5 (4) Dec 14, 2012
That is to say, the electrons will fight for their place around these positively charged holes and they will form a chaotic highly compressed electronic fluid there. The only remaining trick is to arrange these holes so closely into hole stripes, so that the electron fluid will form a continuous phase across crystal and bulk superconductive material. This is the moment, where actual problems begin, because the strong Coulomb pressure of repulsing electrons will indeed cause the repulsion of stripes and expansion if not rupture the atom lattice. The hole stripes must be continuous, yet sufficiently sparse - which are the mutually exclusive requirements. This is the place where the theory of superconductivity ends and the real life begins.

One approach is maintained with Joe Eck, who prepared the room temperature superconductor already. He uses the similar trick, like the engineers, who are preparing metallic glasses.
ValeriaT
1 / 5 (4) Dec 14, 2012
The effective superconductor should be composed of layer of positively charged atoms (copper in high oxidation state), which are surrounded with as as many layers of inertial oxide, as you can prepare (the only purpose of these layers is to serve as binding, which keeps the whole atom lattice together). So that Joe Eck prepared his superconductor from complex mixture of oxides (Tl5Pb2)Ba2Mg2Cu9O17, the atoms of which differ in their size slightly. Such an atoms still form a periodic lattice (..10101010..), but this lattice is relatively sparse and its periodicity is low(..10000100001...). The deep connection of superlatticed superconductors to so-called Berry phases and quasicrystals exists there.

IMO the more robust approach would be to use the atom beam epitaxy and to create such a unnatural heterolattices artificially. In normal crystals the atoms tend to maintain entropy as high as possible and the ..0100001000010... lattice will change into ..000010101000... mixture of phases
ValeriaT
1 / 5 (4) Dec 14, 2012
Design electronic bands with the highest positive Hall coefficient at fermi level and with no pseudogap at fermi level
The problem of modern theoretical physics is, it struggles with finding of as most exact model of HT superconductors, as possible, which leads into complex models full of equations, where the underlying principle remains hidden - actually the more, the simpler such an unifying principle is. And of course, there is still no connection between physical parameters and chemical composition/geometry. Even if you know, that the Hall coefficient is significant, you still don't understand, which structure this coefficient is caused with, so you cannot provide an effective design strategy.

IMO there is a possibility to fabricate the SC layer, if we attract the electrons to thin layer of insulator with strong external field. The repulsive electrons will form a SC phase there.
unknownorgin
1 / 5 (2) Dec 14, 2012
At ValeriaT I think an elctrostatic field focused by curved conductors could force electrons on to a suitable material at a potential of several million volts And in a vacuum this would require very little power. There is a limit of how strong the field can be because atoms begin to sublime from the condutor at some level and this was observed on van de graf generators used for early physics research.
johanfprins
1.8 / 5 (5) Dec 14, 2012
It is known that at low temperatures energy can appear and disappear by means of quantum fluctuations. This is the ONLY mechanism that can supply kinetic energy for motion without requiring dissipation of this energy: And therefore it is the ONLY mechanism that can model super-conduction. If you need to generate the required kinetic-energy in any other manner (for example by accelerating the charge-carriers) you will always have dissipation of the kinetic energy which will be measured as resistance to motion.

I wish ValeriaT will stop spouting so much insane nonsense based on plastic ducks and foam; and that Minich will produce some experimental evidence that his "model" can indeed explain at least ONE experiment on the properties of superconductors. In the case of both these persons there is no experimental fits to ANY of the data which have been measured over 50 years! Hand-waving is NOT PHYSICS!

Minich
1 / 5 (2) Dec 15, 2012
Most effective way to design effective superconductor is combined method of Bozovich's so called "interface superconductivity".

Superconductor and superinsulator have the SAME order parameter. Combine layers of superconductor and superinsulator in one wire and in necessary proportions and you get cheap room temperature superconductor :))))
Minich
1 / 5 (2) Dec 15, 2012
Pseudogap material gives order parameter at high temperature.
Pseudogap order paramiter is transfered through proximity effect to material with electrons with negative effective masses (so called holes). And we get what we want :)))))))
johanfprins
1 / 5 (3) Dec 16, 2012
@ Minich;

When you use an order parameter you do not know what the hell is going on. An order parameter is a useless concept! A phenemenological approach is not fundamental physics. In fact the use of order parameters should be banned. Only incompetent physicists use them!
ValeriaT
1 / 5 (3) Dec 16, 2012
technically all parameters are an evil... competent theory should use fundamental physical constants only, these dimensionless in particular..;-)
Q-Star
1 / 5 (2) Dec 16, 2012
technically all parameters are an evil...


It applies particularly quantifying the Zephyr Effect. It only applies to the longitudinal reference frame.
Minich
1 / 5 (2) Dec 17, 2012
To johanfprins
For cuprates order parameter is very simple parameter. It is even understandable for primary school children and even for girls.
For superfluid Helium superfluid order parameter is also very simple to understand and:
Physical meaning of order parameter for:
1. Pseudogap
2. Superconducting gap
3. "Two roton bound state"(raman scattering) in superfluid Helium 4
IS THE SAME!!!
johanfprins
1 / 5 (3) Dec 17, 2012
To johanfprins
For cuprates order parameter is very simple parameter.


There exist NO UNIQUE physics recipe to derive an order parameter; so it is a meaningless fudge factor which is supposedly valid at all phase-boundaries. This is NOT physics but Voodoo!
Minich
1 / 5 (2) Dec 17, 2012
As a matter of fact so called "two roton bound state" was the first breakethrough for me to unveil the mystery of superfluidity and later superconductivity.
The results of raman scattering in helium 4 and x-ray scattering gave astonishining results: energy of roton was different in those experiments!!!!
I was careful to not accept speculative idea of roton interaction :))))
Simple modification of Bogolyubov theory and....
there is no Bogolyubov and Landau theory...

My fault to predict cuprate like superconductors was rather simple. I was a fool and considered only half filled bands :(((

http://www.bild.m...tate.gif

This pictures i was carefully examined in 1978y.
Minich
1 / 5 (2) Dec 17, 2012
To johanfprins
In our case order parameter is the symmetry crystall and liquid breaking order parameter. You wiil be soon know the details.
johanfprins
1 / 5 (3) Dec 17, 2012
To johanfprins
In our case order parameter is the symmetry crystall and liquid breaking order parameter. You wiil be soon know the details.


Bullshit!

You really do not know Artha from Martha when it comes to superconduction; or any other physics where phase-changes occur.

The first issue that you must explain is how a phase can form so that a current flows through it when the voltage across the material can be grounded at one contact to be zero and then remain zero: This is not possible for any phase which has free charge-carriers which can be accelerated. So where do the charge-carriers get their kinetic energy from so that they leave one contact with zero kinetic-energy and arrive at the other contact while still having zero kinetic-energy?
Minich
1 / 5 (2) Dec 17, 2012
Free charge carrier? It is nonsense!
Periodic potential!!!

One's more question. Do you know where negative energy wave does get energy from? He-he
Think youself. I am not your employee :)

Think youself how in periodic potential there is breake-downed wave function...
johanfprins
1 / 5 (3) Dec 17, 2012
Free charge carrier? It is nonsense!
A free charge-carrier is a localized, charged wave-entity that accelerates when an electric-field is applied. Have you NEVER heard of "conducting materials"? Obviously not.

Periodic potential!!!
What about a periodic potential?

One's more question. Do you know where negative energy wave does get energy from? He-he


Define what you mean by a "negative-energy" wave. Another BS idea in your confused mind. In either case this has no relevance to superconduction!

Think youself how in periodic potential there is breake-downed wave function...


There are energy gaps in the electron-energy spectrum; the significance of which is far above your intelligence level!

Minich
1 / 5 (2) Dec 17, 2012
Periodic potential is the origin of so called BAND THEORY, hehehe
Id est theory of metals, insulators,semiconductors, and as i know, of superconductors, hehehe

But to be the BAND THEORY for superconductors, the band theory must be a little bit modifyed to include special type of MOTION for electrons and ions. There must be not only BLOCH WAVES, but NON-BLOCH WAVES of electon wave functions.

Where did you get such "idiot" ideas?
johanfprins
1 / 5 (3) Dec 18, 2012
Periodic potential is the origin of so called BAND THEORY, hehehe
Thyang God you at least realize this!!

But to be the BAND THEORY for superconductors, the band theory must be a little bit modifyed to include special type of MOTION for electrons and ions. There must be not only BLOCH WAVES, but NON-BLOCH WAVES of electon wave functions.
Bloch waves is a mathematical trick to get answers. Furthermore, The charge carriers must be localized wave-states situated within an energy gap between the delocalized states.

What are your charge-carriers? It is NOT sufficient to say they are "non-Bloch waves". That is obvious that this must be so since even an idiot like you knows this. What you should state is WHAT THEY ARE and how they move when there is no electric-field to drive them on? PLEASE at least TRY and think!! IDIOT!!

Minich
1 / 5 (2) Dec 18, 2012
To "idiot" specialist
Try to answer the difference between so called "superconducting" electron and "normal" electron.
Between "superfluid" helium atoms and "normal" helium atoms.

Where did you see "Mott" insulated helium atoms and "localized" helium atoms in helium LIQUID? hehehe
Why helium liquid DOES NOT have pseudogap?

Idiot? hehehe
johanfprins
1 / 5 (2) Dec 18, 2012
To "idiot" specialist
Try to answer the difference between so called "superconducting" electron and "normal" electron.


What you in your stupidity calls a normal "electron" is a wave-packet that accelerates when an electric field is applied. A superconducting charge-carrier is a localised electron orbital which DO NOT accelerate when an electric field is applied
Between "superfluid" helium atoms and "normal" helium atoms.
Superfluid flow is by helium atoms NOT by electron-orbitals: You are even a bigger IDIOT than I thought you are.

Where did you see "Mott" insulated helium atoms and "localized" helium atoms in helium LIQUID? hehehe
Why helium liquid DOES NOT have pseudogap?
Only an idiot like you will think that helium's superfluidity is exactly the same as superconduction. THEY ARE NOT!!!

I have better things to do than to waste my time with an idiot whoc claims he can model SC but cannot produce a single graph where his model has been fitted.
rubberman
1 / 5 (2) Dec 18, 2012
@ Minich: I believe the goal is room temperature superconduction. Where did you get your room temperature helium superfluid?
Minich
1 / 5 (2) Dec 18, 2012
Electron wave functione ever accelerate not depending on normal or superconducting.
The RESULTS of acceleration are different :) hehehe
Nobody could not get correct electron wave functions in superconductor or in pseudogap state. Though it is very simpe case in Kronig Penney model or Frohlich 1D phonon superconductivity of 1954y.
Frohlich had not enough imagination to to make next step in band theory to receive Nobel Prize instead of BCS.
Minich
1 / 5 (2) Dec 18, 2012
@ Minich: I believe the goal is room temperature superconduction. Where did you get your room temperature helium superfluid?

The goal is not to get RTS.
The goal is to get answer to the question how nature is created.

To be or not to be what is the QUESTION!
rubberman
1 / 5 (2) Dec 18, 2012
@ Minich: I believe the goal is room temperature superconduction. Where did you get your room temperature helium superfluid?

The goal is not to get RTS.
The goal is to get answer to the question how nature is created.

To be or not to be what is the QUESTION!


To answer those questions, the physics world in general is going to have to abandon alot of dogma they have been clinging to for far too long, a gravity dominated universe for one, wave-partical duality as Johan actually wrote a book about for another. Oh yeah, and the entire monetary system has to go too! :))) hehehe
Minich
1 / 5 (2) Dec 18, 2012
Free charge carrier? It is nonsense!
A free charge-carrier is a localized, charged wave-entity that accelerates when an electric-field is applied.

Hehehe
I imagined. Electron in hydrogen atom. Localised hehehe wave function. Electron in quantum well. And we apply electric field. What is the value of electron accelerations? In meters/((seconds)^2)
Hehehe and potetial energy in solid is your's boolshit hehehe
Minich
1 / 5 (2) Dec 18, 2012
To rubberman

Johan wrote a book.
I also wrote some books. We all have the right to write any nonsense in our books :))))))
rubberman
1 / 5 (2) Dec 18, 2012
To rubberman

Johan wrote a book.
I also wrote some books. We all have the right to write any nonsense in our books :))))))


If you wrote a nonsensical book, I hope it was at least entertaining. Wave/partical duality as far as photons and electrons has been proven nonsensical by double slit defraction of both entities. They truly are waves with a center of mass until forced to change or morph due boundary condition parameters. Ironically this voids concepts such as entanglement which ALOT of research is predicated around.....
Minich
1 / 5 (2) Dec 18, 2012
I wrote some tecnical documentation. They are counted in "books". About for 10-20 projects. About 100 books.
Laser location of airplanes, rocket missiles, intercontinental missiles, spaceships.
Quantum feedback systems.
Industrial robotics. Computer aided design. Computer aided machinery.
Real time operating system.
Medical hardware complex for professional foot-platemen.
I also wrote two books about dating in internet and about search engine optimazation. That two books are unpublished. I refused work for nothing on a publisher.

I think that the so called center of mass in quantum mechanics is a mythical personage :)
Minich
1 / 5 (2) Dec 18, 2012
Minich
1 / 5 (2) Dec 18, 2012
add one link to my previos post
http://yandex.com...fluidity
Minich
1 / 5 (2) Dec 18, 2012
@ Minich: I believe the goal is room temperature superconduction. Where did you get your room temperature helium superfluid?

1. We are interested not only in helium.
For example zero spin (para) hydrogen molecules
http://physics.ap...5.133401
can be stored in nanomaterial (carbon tubes) in liquid form under high pressure and used for car fuel.

2. Neutron liquid can be used in nuclear energy reactors. It's pseudogapped neutron liquid can be of greate impotance
to reduce the geometric size of reactors.
It is already signs that glitches of neutron stars cannot be explained by superfluidity of neutrons, but pseudogapping of the crust of neutron star.
http://physics.ap...9.241103
ValeriaT
1 / 5 (2) Dec 18, 2012
So that everyone is writing an articles and books - but nobody gives a sh*t about it, because everyone has its own research and his own family, so that everyone's writing his own articles and books - so we are flooded with books spewed with ignorants... As Robert Wilson, a former president of APS once said, unification is a pretty thing - but the research of it is even damn prettier and this would all end, if we would admit the existence of it.
johanfprins
1 / 5 (2) Dec 19, 2012
@Minich

Message for Rubberman: This guy is such a fruitcake it is a wsate of time to try and penetrate his thick neanderthal skull.

I am now in Cape Town with my grandchildren and refuse to divide my time between my grandchildren and this Minich-fruitcake while I am here for Xmas and New Year!
rubberman
1 / 5 (2) Dec 19, 2012
Damn...I was hoping for a gander at his ideas about internet dating...oh well, as I said earlier, Happy holidays Johan.

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