Pressure-induced enhancement of the superconducting transition temperature in La2O2Bi3AgS6

Esteban I Paredes Aulestia; Xinyou Liu; Yiu Yung Pang; Chun Wa So; Wing Chi Yu; Swee K Goh; Kwing To Lai

doi:10.1088/1361-648X/ac34af

Pressure-induced enhancement of the superconducting transition temperature in La₂O₂Bi₃AgS₆

J Phys Condens Matter. 2021 Nov 15;34(6). doi: 10.1088/1361-648X/ac34af.

Authors

Esteban I Paredes Aulestia¹, Xinyou Liu¹, Yiu Yung Pang¹, Chun Wa So², Wing Chi Yu², Swee K Goh¹, Kwing To Lai¹

Affiliations

¹ Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong Special Administrative Region of China.
² Department of Physics, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region of China.

PMID: 34715684
DOI: 10.1088/1361-648X/ac34af

Abstract

Charge density wave (CDW) instability is often found in phase diagrams of superconductors such as cuprates and certain transition-metal dichalcogenides. This proximity to superconductivity triggers the question on whether CDW instability is responsible for the pairing of electrons in these superconductors. However, this issue remains unclear and new systems are desired to provide a better picture. Here, we report the temperature-pressure phase diagram of a recently discovered BiS₂superconductor La₂O₂Bi₃AgS₆, which shows a possible CDW transition atT* ∼ 155 K and a superconducting transition atT_c∼ 1.0 K at ambient pressure, via electrical resistivity measurements. Upon applying pressure,T* decreases linearly and extrapolates to 0 K at 3.9 GPa. Meanwhile,T_cis enhanced and reaches maximum value of 4.1 K at 3.1 GPa, forming a superconducting dome in the temperature-pressure phase diagram.

Keywords: BiS2-superconductors; charge density wave; high pressure.