Nearly isotropic superconductivity in (Ba,K)Fe2As2

H. Q. Yuan (), J. Singleton, F. F. Balakirev, S. A. Baily, G. F. Chen, J. L. Luo and N. L. Wang
Additional contact information
H. Q. Yuan: Zhejiang University, Hangzhou, Zhejiang 310027, China
J. Singleton: NHMFL, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA
F. F. Balakirev: NHMFL, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA
S. A. Baily: NHMFL, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA
G. F. Chen: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science
J. L. Luo: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science
N. L. Wang: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science

Nature, 2009, vol. 457, issue 7229, 565-568

Abstract: Iron-arsenic superconductors: a sense of direction Superconductivity has been observed in iron-arsenic (or iron pnictide) compounds with critical transition temperatures as high as 56 K, inviting comparison with the high-Tc copper oxides. The copper oxides have quasi-two-dimensional electronic properties, which led to speculation that extreme anisotropy (direction dependence) is a requirement for superconductivity at temperatures above 40 K. Yuan et al. report that this is not the case: the superconducting properties of (Ba,K)Fe2As2 are in fact quite isotropic. This behaviour is strikingly different from all previously known layered superconductors.

Date: 2009
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DOI: 10.1038/nature07676

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