Superconductivity in Semimetallic Bi3O2S3

Abstract

Here we report further investigation on the thermodynamic, and transport properties, and the first assessment of theoretical calculations for the BiS2-layered Bi3O2S3 superconductor. The polycrystalline sample is synthesized with the superconducting transition temperature of Tc_onset = 5.75 K, that drops to 3.3 K by applying hydrostatic pressure of 6 kbar. Density-of-states calculations give substantial hybridization between Bi, O and S, with the largest Bi component at DOS, which supports the idea that BiS2 layer is relevant for producing electron-phonon coupling. The electron charge carrier concentration of only 1.5 x 10^19 cm-3 for Bi3O2S3 is additionally suggestive of strong electron-phonon interaction in Bi-O-S system. The analysis of Seebeck coefficient results strongly suggests that Bi3O2S3 is a semimetal. In fact, the semimetallic or narrow band gap behavior may be general in the BiS2-layered class of materials, including that of Bi4O4S3.

3 figures; submitted to PRB

References in corpus (7)

• Superconductivity in novel BiS2-based layered superconductor LaO1-xFxBiS2
• Novel BiS2-based layered superconductor Bi4O4S3
• Minimal electronic models for superconducting BiS${}_2$ layers
• Pressure Study of BiS2-Based Superconductors Bi4O4S3 and La(O,F)BiS2
• Pairing Symmetry in Layered BiS${}_2$ Compounds Driven by Electron-Electron Correlation
• Superconducting and thermoelectric properties of new layered Superconductor Bi4O4S3
• Bulk superconductivity in single phase Bi3O2S3

Cited by in corpus (5)

• Material Development and Physical Properties of BiS2-Based Layered Compounds
• Thermoelectric properties of new Bi-chalcogenide layered compounds
• Unusual mixed valence of Eu in two new materials EuSr2Bi2S4F4 and Eu2SrBi2S4F4: Mössbauer and X-ray photoemission Spectroscopy investigations
• Unconventional isotope effect on transition temperature in BiS2-based superconductor Bi4O4S3
• Pressure Effects on Superconducting Properties of the BiS2-Based Superconductor Bi2(O,F)S2