ISSN:
1434-6036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We have studied the effect of hydrostatic pressures up to 20 Kbar on the temperature dependence of the resistivity σ(T) and the effect of quasihydrostatic pressure up to 200 Kbar on the lattice parameters of YBa2Cu3O x for different oxygen concentrations (x=6.95–6.2). Pressure produces a decrease of resistivity in normal state, an increase ofT c , and a suppression of semiconducting-like resistivity σ(T) at lowx. The dependence of dT c (x)/dP onx is nonmonotonic; the record values of dT c /dP=(1.0±0.1) K/Kbar are observed forx=6.7 and 6.8. The derivative dlnσ/dP atT=293 K differs by the factor 1.8 between superconducting and nonsuperconducting compounds. The compressibility and its pressure derivative alonga, b andc-directions in YBa2Cu3O x have been determined. The most remarkable variation is alongc-direction. A nonmonotonic dependence of dk c (x)/dP onx has been observed. The results are discussed in the context of localized effects in disordered oxygen-deficient YBa2Cu3O x .
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01390810
