Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Evolution of Superconducting-Transition Temperature with Superfluid Density and Conductivity in Pressurized Cuprate Superconductors
Ist Teil von
Chinese physics letters, 2024-04, Vol.41 (4), p.47401
Ort / Verlag
United States: IOP Publishing
Erscheinungsjahr
2024
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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.