Dependence of the critical temperature on atomic structure in orthorhombic YBa2Cu3Ox.

Abstract

The method of parent compounds has been used to establish an approximate correlation between the variation of the critical temperature, {ital T}{sub {ital c}}, and the variation of the potential difference, {Delta}{ital V}{sub {ital A}}, of a hole at the apex and planar oxygen sites within the superconducting phase region of YBa{sub 2}Cu{sub 3}O{sub {ital x}}. The resulting model was used to predict the pressure derivative of {ital T}{sub {ital c}} under hydrostatic pressure, giving derivatives and standard uncertainties of {ital dT}{sub {ital c}}/{ital dP}=6.1{plus_minus}0.5 K/GPa for {ital x}=6.6 and {ital dT}{sub {ital c}}/{ital dP}={minus}0.6{plus_minus}0.3 K/GPa for {ital x}=6.93. {copyright} {ital 1996 The American Physical Society.}