J. Phys. Soc. Jpn. 85, 063705 (2016) [4 Pages]

Effects of c/a Anisotropy and Local Crystal Structure on Superconductivity in AFe2(As1−xPx)2 (A = Ba1−ySry, Sr1−yCay and Eu)

+ Affiliations
1Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan2Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan3Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan

We investigated the effects of c/a anisotropy and local crystal structure on superconductivity (SC) in As/P solid solution systems, AFe2(As1−xPx)2 (A122P) with various A ions. With decreasing A site atomic size from A = Ba to Eu, the structural anisotropy decreases, and the rate of decreasing with x also increases. The rapid narrowing of the region of antiferromagnetic composition (x) can be considered to be a result of this anisotropy change due mainly to the change in the Fermi surface (FS) nesting condition. By contrast, although the structural anisotropy systematically changes, the maximum Tc values are almost the same in all A122P systems except for Eu122P. These results indicate that the modification of the FS topology via the structural anisotropy does not affect SC. However local structural parameters, such as pnictogen height, are crucial for Tc.

©2016 The Physical Society of Japan


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