Possible pairing mechanism switching driven by structural symmetry breaking in BiS2-based layered superconductors

Abstract

Investigation of isotope effects on superconducting transition temperature (Tc) is one of the useful methods to examine whether electron-phonon interaction is essential for pairing mechanisms. The layered BiCh2-based (Ch: S, Se) superconductor family is a candidate for unconventional superconductors, because unconventional isotope effects have previously been observed in La(O,F)BiSSe and Bi4O4S3. In this study, we investigated the isotope effects of 32S and 34S in the high-pressure phase of (Sr,La)FBiS2, which has a monoclinic crystal structure and a higher Tc of 10 K under high pressures, and observed conventional-type isotope shifts in Tc. The conventional-type isotope effects in the monoclinic phase of (Sr,La)FBiS2 are different from the unconventional isotope effects observed in La(O,F)BiSSe and Bi4O4S3, which have a tetragonal structure. The obtained results suggest that the pairing mechanisms of BiCh2-based superconductors could be switched by a structural-symmetry change in the superconducting layers induced by pressure effects.

arXiv comment18 pages, 3 figures, 1 table, supplementary file

References in corpus (23)

• Conventional superconductivity at 203 K at high pressures
• Superconductivity at 250 K in lanthanum hydride under high pressures
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity in novel BiS2-based layered superconductor LaO1-xFxBiS2
• Novel BiS2-based layered superconductor Bi4O4S3
• Superconductivity induced by La doping in Sr1-xLaxFBiS2 system
• Pressure-induced Enhancement of Superconductivity in BiS${}_2$-layered LaO${}_{1-x}$F${}_x$BiS${}_2$
• In-plane chemical pressure essential for superconductivity in BiCh2-based (Ch: S, Se) layered structure
• Inverse Iron Isotope Effect on the transition temperature of the (Ba,K)Fe2As2 superconductor
• Nematic superconductivity in doped Bi2Se3 topological superconductors
• Material Development and Physical Properties of BiS2-Based Layered Compounds
• Enhancement of superconductivity near the pressure-induced semiconductor-metal transition in BiS2-based compounds LnO(0.5)F(0.5)BiS2 (Ln = La, Ce, Pr, Nd)
• Unconventional superconductivity in the BiS${}_2$-based layered superconductor NdO${}_{0.71}$F${}_{0.29}$BiS${}_2$
• Impact of hydrostatic pressure on superconductivity of Sr0.5La0.5FBiS2
• Raman scattering investigation of the electron-phonon coupling in superconducting Nd(O,F)BiS${}_2$
• Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS2-Based REO0.5F0.5BiS2 (RE = La, Ce, Pr, and Nd)
• Weak phonon-mediated pairing in BiS${}_2$ superconductor from first principles
• Indication of unconventional superconductivity in layered bismuth chalcogenide superconductor LaO0.6F0.4Bi(S,Se)2 revealed by Se isotope effect
• Conventional s-wave superconductivity in BiS2-based NdO0.71F0.29BiS2 revealed by thermal transport measurements
• Strong bilayer coupling induced by the symmetry breaking in the monoclinic phase of BiS${}_2$-based superconductors
• Two-Fold-Symmetric Magnetoresistance in Single Crystals of Tetragonal BiCh2-Based Superconductor LaO0.5F0.5BiSSe
• Unconventional isotope effect on transition temperature in BiS2-based superconductor Bi4O4S3
• Two-fold symmetry of in-plane magnetoresistance anisotropy in the superconducting states of BiCh2-based LaO0.9F0.1BiSSe single crystal

Cited by in corpus (3)

• Bulk superconductivity in Pb-substituted BiS${}_2$-based compounds studied by hard-x-ray spectroscopy
• High-pressure effects on superconducting properties and crystal structure of Bi-based layered superconductor La2O2Bi3Ag0.6Sn0.4S6
• High pressure effects on La(O,F)BiS${}_2$ single crystal using diamond anvil cell with dual-probe diamond electrodes