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.

6 pages, 4 figures

References in corpus (11)

• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeO${}_{1-x}$F${}_x$BiS${}_2$
• Minimal electronic models for superconducting BiS${}_2$ layers
• Superconductivity of F-substituted LnOBiS2 (Ln = La, Ce, Pr, Nd, Yb) compounds
• Ferroelectric Soft Phonons, Charge Density Wave Instability and Strong Electron-Phonon Coupling in BiS2-Layered Superconductors
• Superconductivity induced by La doping in Sr1-xLaxFBiS2 system
• Pressure Study of BiS2-Based Superconductors Bi4O4S3 and La(O,F)BiS2
• First single crystal growth and structural analysis of superconducting layered bismuth oxyselenide; La(O,F)BiSe2
• Growth and superconducting anisotropies of F-substituted LaOBiSe2 single crystals
• BCS-like superconductivity in NdO${}_{1-x}$F${}_x$BiS${}_2$ ($x$ = 0.3 and 0.5) single crystals
• Significant enhancement of superconductivity under hydrostatic pressure in CeO0.5F0.5BiS2 superconductor

Cited by in corpus (2)

• Pressure-enhanced superconductivity in Eu${}_3$Bi${}_2$S${}_4$F${}_4$
• Pressure-induced phase transition for single crystalline LaO0.5F0.5BiSe2