Pressure-tuned enhancement of superconductivity and change of ground state properties in LaO0.5F0.5BiSe2 single crystals
Jianzhong Liu, Sheng Li, Yufeng Li, Xiyu Zhu, Hai-Hu Wen
DOI 10.1103/PhysRevB.90.094507 · Physical Review B
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Abstract
By using a hydrostatic pressure, we have successfully tuned the normal state property and superconductivity in LaO0.5F0.5BiSe2 single crystals. It is found that, with the increase of pressure, the original superconducting phase with Tc∼3.5 K can be tuned to a state with lower Tc, and then a new superconducting phase with Tc∼6.5 K emerges. Accompanied by this crossover, the normal state is switched from that with a low temperature resistivity upturning to a metallic one. Accordingly, the normal state resistivity also shows a nonmonotonic change with the external pressure. Furthermore, by applying a magnetic field, the new superconducting state under pressure with Tc∼6.5 K is suppressed, and the recovered normal state reveals a resistivity-upturning feature again. These results illustrate a nontrivial relationship between the normal state property and superconductivity in this newly discovered superconducting system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaO0.5F0.5BiSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure unresolved | onset |
| LaO0.5F0.5BiSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure unresolved | onset |
| LaO0.5F0.5BiSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | 2.17 GPa | onset |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.6 | Pressure not reported | unknown |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure unresolved | unknown |
| LaO0.5F0.5BiS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | 2 GPa | unknown |
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