Ionic model for the stability of the Y-Ba-Cu high-temperature superconductors

N. F. Wright; W. H. Butler

doi:10.1103/PhysRevB.42.4219

← Back to search

Ionic model for the stability of the Y-Ba-Cu high-temperature superconductors

N. F. Wright, W. H. Butler

DOI 10.1103/PhysRevB.42.4219 · 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

The structural stability of the Y-Ba-Cu high-temperature superconductors is described using a modified ionic model. The necessary and sufficient interatomic forces required for static stability within this model are determined and the resulting energy parameters are used to calculate the phonon frequencies. The best-fit parameters are determined for the different Y-Ba-Cu-O structures, and the differences in their internal forces are explained. The possibility of a three-chain material is explored.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure not reported	onset
YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	unknown