Future information technologies: 3-D quantum spin liquid revealed

Future information technologies: 3D quantum spin liquid revealed
Two of the four magnetic interactions form a new three-dimensional network of corner-sharing triangles, known as the hyper-hyperkagome lattice, leading to the quantum spin liquid behavior in PbCuTe2O6. Credit: HZB

Quantum spin liquids are candidates for potential use in future information technologies. So far, quantum spin liquids have usually only been found in one or two dimensional magnetic systems only. Now an international team led by HZB scientists has investigated crystals of PbCuTe2O6 with neutron experiments at ISIS, NIST and ILL.

They found spin liquid behaviour in 3-D, due to a so called hyper-hyperkagome lattice. The fit extremely well to theoretical simulations also done at HZB.

IT devices today are based on electronic processes in semiconductors. The next real breakthrough could be to exploit other , for example interactions between tiny magnetic moments in the material, the so-called spins. So-called quantum-spin liquid materials could be candidates for such new technologies. They differ significantly from conventional magnetic materials because quantum fluctuations dominate the magnetic interactions: Due to geometric constraints in the , spins cannot all "freeze" together in a —they are forced to fluctuate, even at temperatures close to absolute zero.

Quantum spin liquids: a rare phenomenon

Quantum spin liquids are rare and have so far been found mainly in two-dimensional magnetic systems. Three-dimensional isotropic spin liquids are mostly sought in materials where the magnetic ions form pyrochlore or hyperkagome lattices. An international team led by HZB physicist Prof. Bella Lake has now investigated samples of PbCuTe2O6, which has a three-dimensional lattice called a hyper-hyperkagome lattice.

Magnetic interactions simulated

HZB physicist Prof. Johannes Reuther calculated the behaviour of such a three-dimensional hyper-hyperkagome with four magnetic interactions and showed that the system exhibits quantum-spin behaviour with a specific magnetic energy spectrum.

Experiments at neutron sources find 3-D quantum spin liquid

With neutron experiments at ISIS, UK, ILL, France and NIST, USA the team was able to prove the very subtle signals of this predicted behaviour. "We were surprised how well our data fit into the calculations. This gives us hope that we can really understand what happens in these systems," explains first author Dr. Shravani Chillal, HZB.

More information: Shravani Chillal et al, Evidence for a three-dimensional quantum spin liquid in PbCuTe2O6, Nature Communications (2020). DOI: 10.1038/s41467-020-15594-1

Journal information: Nature Communications

Citation: Future information technologies: 3-D quantum spin liquid revealed (2020, May 11) retrieved 21 February 2024 from https://phys.org/news/2020-05-future-technologies-d-quantum-liquid.html
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