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arXiv · 1101.0462

Superconductivity at 32K and anisotropy in Tl0.58Rb0.42Fe1.72Se2 crystals

Hangdong Wang·Chihen Dong·Zujuan Li·Shasha Zhu·Qianhui Mao·Chunmu Feng·H. Q. Yuan·Minghu Fang
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Abstract

Single crystals of Tl0.58Rb0.42Fe1.72Se2 are successfully grown with the superconducting transition temperatures Tconset=32K and Tczero=31.4K. The Hall coefficient exhibits a multi-band behavior, which is very similar to that of all other Fe-based superconductors. We found that the susceptibility at the normal state decreases with decreasing the temperature, indicating a strong antiferromagnetic (AFM) spin fluctuation at the normal state, which might be related to the superconductivity (SC). We also determined the upper critical fields in ab-plane and along c-axis. The anisotropy of the superconductivity determined by the ratio of Hc2ab and Hc2c is estimated to 5.0, which is larger than that in (Ba,K)Fe2As2 and BaFe2-xCoxAs2, but smaller than that in cuprate superconductors.

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Hangdong Wang, Chihen Dong, Zujuan Li, Shasha Zhu, Qianhui Mao, Chunmu Feng, H. Q. Yuan, Minghu Fang. 2011-01-03. Superconductivity at 32K and anisotropy in Tl0.58Rb0.42Fe1.72Se2 crystals. https://doi.org/10.1209/0295-5075%2F93%2F47004

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