Iron-pnictide electron orbital pairing promises higher-temperature superconductors

The paper, Orbital-Independent Superconducting Gaps in Iron Pnictides, was published in the April 29, 2011 issue of Science. Lead researcher Takahiro Shimojima (affiliated with the University of Tokyo’s Institute for Solid State Physics, and the Japan Science and Technology Agency’s Core Research for Evolutional Science and Technology) notes that while high transition temperature superconductivity of up to 55K (-218C) in ferropnictides was first observed in 2008, this behavior is not predicted from standard electron pairing based on lattice vibrations. Therefore, says Shimojima, an alternate explanation was needed.

(Ferropnictides – also known as Fe-pnictides and iron pnictides – are compounds classified as members of the so-called nitrogen group, a periodic table group that includes nitrogen, phosphorus, arsenic, antimony, bismuth, and ununpentium – elements with five electrons in their outermost shell. Pnictides are binary compounds of this group. The new class of superconductors Shimojima and his team investigated has conducting layers of iron and arsenic.)

Shimojima and his team focused on what is know as the superconducting gap magnitude – the strength of Cooper pair electron pairing – in various electron orbitals. Using laser-ARPES (laser angle-resolved photoemission spectroscopy), the team determined that electron orbitals, not spin, account for ferropnictide superconductivity. They therefore concluded that electron orbitals – specifically, orbital fluctuations, interorbital pairing induced by magnetism, or a combination of the two – are a third way in which electrons form Cooper pairs.

What prompted the team to consider orbital pairing as a novel binding mechanism in HT superconductivity? “An important insight was Fermi surface orbital polarization in the anti-ferromagnetic metal phase of parent compound BaFe₂As₂ observed by laser-ARPES,” notes Shimojima. “It was surprising for us that its ground state is realized through orbital-dependent electronic reconstruction. We also found that this result indirectly supported the orbital ordering proposed by theoretical research. We then became curious about the effect of the orbital degrees of freedom on the material’s superconductivity.”

Laser-ARPES was the key tool in the team’s discovery. “One very important technique we developed was the variable laser polarization for examining orbital characteristics,” says Shimojima. “We also achieved high-energy resolution and bulk sensitivity in order to capture high quality data about the superconducting gaps. As a result, we were able to separate the two peak structure in the (Ba,K)Fe₂As₂ spectrum, which previously makes difficult to interpret ARPES data.”

Going forward, Shimojima points out, if other materials having several entangled orbitals near Fermi level are discovered, it may have the potential to show even higher transition temperature superconductivity due to orbital pairing. “For example,” he adds, “if the transition temperature approaches room temperature, superconducting wires for lossless electronic transportation and storage will quickly be deployed worldwide.”

And so the dream lives on.

More information:
* Orbital-Independent Superconducting Gaps in Iron Pnictides, Published Online 7 April 2011, Published in Science 29 April 2011: Vol. 332 no. 6029 pp. 564-567, DOI: 10.1126/science.1202150
* University of Tokyo Institute for Solid State Physics
* Japan Science and Technology Agency Core Research for Evolutional Science and Technology

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