Pressure tuning of the iron-based superconductor (Ca0.73La0.27)FeAs2
M. Y. Li, J. Huang, W. T. Guo, R. Yang, T. Hu, A. B. Yu, Y. L. Huang, M. Zhang, W. Zhang, J.-M. Zhang, H. Xiao
DOI 10.1103/PhysRevB.103.024502 · Physical Review B
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Abstract
Pressure is an efficient tool to tune the electronic structure of iron-based superconductors. Here, we performed systematic high pressure transport and magnetization measurements on (Ca0.73La0.27)FeAs2 single crystal samples. Filamentary superconductivity is induced under a small applied pressure P=1.6 GPa. At P=3.2 GPa, the superconductivity becomes bulk. It is found that Tc increases initially and then decreases with further increasing pressure, forming a dome shape. Hall resistivity is measured simultaneously and the Hall coefficient RH at 50 K shows nonmonotonic dependence on pressure. In addition, RH reverse sign at a critical pressure Pc=3.9 GPa, where Tc reaches the maximum and there is a sudden increase in superconducting diamagnetism. Theoretical calculation results show a pressure induced Lifshitz transition of the Fermi surface which might be responsible for the appearance of superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Ca0.73La0.27)FeAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.7 | 1.6 GPa | onset |
| (Ca0.73La0.27)FeAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.6 | 1.6 GPa | midpoint |
| (Ca0.73La0.27)FeAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0 | 2.3 GPa | unknown |
| Ca1-xLaxFeAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | unknown |
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