Pressure Tuned Enhancement of Superconductivity and Change of Ground State Properties in LaO0.5F0.5BiSe2 Single Crystals

Abstract

By using a hydrostatic pressure, we have successfully tuned the ground state and superconductivity in LaO0.5F0.5BiSe2 single crystals. It is found that, with the increase of pressure, the original superconducting phase with Tc about 3.5 K can be tuned to a state with lower Tc, and then a new superconducting phase with Tc about 6.5 K emerges. Accompanied by this crossover, the ground state is switched from a semiconducting state 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 about 6.5 K is suppressed, and the normal state reveals a weak semiconducting feature again. These results illustrate a non-trivial relationship between the normal state property and superconductivity in this newly discovered superconducting system.

arXiv comment6 pages, 4 figures

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Cited by in corpus (9)

• Material Development and Physical Properties of BiS2-Based Layered Compounds
• Pressure-enhanced superconductivity in Eu${}_3$Bi${}_2$S${}_4$F${}_4$
• Pressure-induced superconductivity in topological semimetal NbAs2
• Strong bilayer coupling induced by the symmetry breaking in the monoclinic phase of BiS${}_2$-based superconductors
• Pressure-Induced Phase Transition in La${}_{1-x}$Sm${}_x$O${}_{0.5}$F${}_{0.5}$BiS${}_2$
• Pressure-induced phase transition for single crystalline LaO0.5F0.5BiSe2
• Superconductivity and abnormal pressure effect in Sr0.5La0.5FBiSe2 superconductor
• Anomalous impact of hydrostatic pressure on superconductivity of polycrystalline LaO0.5F0.5BiSe2
• Pressure-induced enhancement of two-dimensionality in LaO1-xFxBi(Se/S)2 superconductors