Superconductivity and magnetic properties of single crystals of K0.75Fe1.66Se2 and Cs0.81Fe1.61Se2
J. J. Ying, X. F. Wang, X. G. Luo, A. F. Wang, M. Zhang, Y. J. Yan, Z. J. Xiang, R. H. Liu, P. Cheng, G. J. Ye, X. H. Chen
DOI 10.1103/PhysRevB.83.212502 · Physical Review B
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Abstract
We successfully grew the high-quality single crystals of AxFe2Se2 (A = K and Cs) by self-flux method. Sharp superconducting transition was observed for both types of crystals. The crystals show the onset superconducting transition temperatures (Tc) of 31 and 30 K for K and Cs compounds, respectively, with nearly 100% superconductive shielding fraction. The crystals show quite high resistivity in the normal state of more than 160 and 1300 mΩ cm maximum resistivity for KxFe2Se2 and CsxFe2Se2 single crystals, respectively. Much larger upper critical field Hc2 is inferred from low-temperature isomagnetic-field magnetoresistance in these crystals than in FeSe. The anisotropy Hc2ab(0)/Hc2c(0) is estimated to be around 3 for both of the two materials. Anisotropic peculiar magnetic behavior in normal state has been found for CsxFe2Se2
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K0.75Fe1.66Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure unresolved | onset |
| K0.75Fe1.66Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.7 | Pressure unresolved | zero_resistance |
| K0.75Fe1.66Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure unresolved | onset |
| Cs0.81Fe1.61Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure unresolved | onset |
| Cs0.81Fe1.61Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26.5 | Pressure unresolved | zero_resistance |
| Cs0.81Fe1.61Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.5 | Pressure unresolved | onset |
| LaFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure unresolved | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | 4.5 GPa | onset |
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