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Analysis of the superconducting transition temperature's pressure dependence for YBa2Cu3O7−δ within a BCS framework

✍ Scribed by J.J. Neumeier

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
606 KB
Volume
233
Category
Article
ISSN
0921-4534

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✦ Synopsis

The pressure dependence of the superconducting transition temperature dT,/dP of the YBa2Cus07 high-T, superconductor is addressed. A value of dln TJdln V (where Vis the volume) comparable to the phonon Grtineisen parameter is revealed, thereby allowing for reasonable analysis using the Allen-Dynes equation for T,. The electronic contribution to the electron-phonon coupling parameter q is found to be positively influenced by pressure, with a volume dependence of dln n/din Ve -3, and to offset the Griineisen parameter's contribution in the equation for dln TJdln Vby about a factor of 1.5 thus resulting in a positive pressure dependence of T,. This value is comparable to that observed in conventional superconductors. The possible influence of a van Hove singularity near the Fermi energy on T,(P) results is discussed.

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✍ J.J. Neumeier; M.B. Maple; M.S. Torikachvili 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 415 KB

The effect of nearly hydrostatic pressure to 20 kbar on the superconducting transition temperature 7, of (Y, \_ ,Pr,)BaCu@\_, compounds with 06~~0.5 was determined by means of low frequency ac electrical resistivity measurements. The application of pressure to this system reveals striking effects w