Evolution of Superconducting-Transition Temperature with Superfluid Density and Conductivity in Pressurized Cuprate Superconductors

• Published in: Chinese physics letters Vol. 41; no. 4; pp. 47401 - 117
• Main Authors: Zhao, Jinyu, Cai, Shu, Chen, Yiwen, Gu, Genda, Yan, Hongtao, Guo, Jing, Han, Jinyu, Wang, Pengyu, Zhou, Yazhou, Li, Yanchun, Li, Xiaodong, Ren, Zhian, Wu, Qi, Zhou, Xingjiang, Ding, Yang, Xiang, Tao, Mao, Ho-kwang, Sun, Liling
• Format: Journal Article
• Language: English
• Published: United States Chinese Physical Society and IOP Publishing Ltd 01.04.2024; IOP Publishing
• Subjects: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/41/4/047401

What factors fundamentally determine the value of superconducting transition temperature T c in high temperature superconductors has been the subject of intense debate. Following the establishment of an empirical law known as Homes’ law, there is a growing consensus in the community that the T c value of the cuprate superconductors is closely linked to the superfluid density ( ρ s ) of its ground state and the conductivity ( σ ) of its normal state. However, all the data supporting this empirical law ( ρ s = AσT c ) have been obtained from the ambient-pressure superconductors. In this study, we present the first high-pressure results about the connection of the quantities of ρ s and σ with T c , through the studies on the Bi 1.74 Pb 0.38 Sr 1.88 CuO 6+ δ and Bi 2 Sr 2 CaCu 2 O 8+ δ , in which the value of their high-pressure resistivity ( ρ = 1/ σ ) is achieved by adopting our newly established method, while the quantity of ρ s is extracted using Homes’ law. We highlight that the T c values are strongly linked to the joint response factors of magnetic field and electric field, i.e., ρ s and σ , respectively, implying that the physics determining T c is governed by the intrinsic electromagnetic fields of the system.