Effect of physical and chemical pressure on the superconductivity of high-temperature oxide superconductors

A. A. R. Fernandes; J. Santamaria; S. L. Bud’ko; O. Nakamura; J. Guimpel; Ivan K. Schuller

doi:10.1103/PhysRevB.44.7601

← Back to search

Effect of physical and chemical pressure on the superconductivity of high-temperature oxide superconductors

A. A. R. Fernandes, J. Santamaria, S. L. Bud’ko, O. Nakamura, J. Guimpel, Ivan K. Schuller

DOI 10.1103/PhysRevB.44.7601 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We have compared the changes in the structure and superconductivity of the Gd1−xYxBa2Cu3O7−δ system produced by rare-earth-ion substitution (chemical pressure) and by hydrostatic pressure. Although the application of both chemical and physical pressure result in an overall compression of the unit cell, the effect on Tc is of opposite sign. A detailed comparison of the evolution of the structure under both kinds of pressure shows that the origin of this qualitatively different behavior in Tc is correlated with the apical oxygen to CuO2-plane distance which also presents opposite trends. The origin of this difference is found in the extremely inhomogeneous character of the chemical pressure which, in spite of inducing an overall compression of the structure, produces an expansion of certain regions of the unit cell.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Gd1-xYxBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	94	Pressure unresolved	midpoint
GdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	94.5	Pressure unresolved	midpoint
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure unresolved	midpoint
GdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95.5	1.6 GPa	midpoint
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92.5	1.6 GPa	midpoint