Physics – Condensed Matter – Superconductivity
Scientific paper
2000-01-20
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures, submitted to PRL
Scientific paper
10.1103/PhysRevLett.85.2376
We present high-resolution capacitance dilatometry studies from 5 - 500 K of untwinned YBa2Cu3Ox (Y123) single crystals for x ~ 6.95 and x = 7.0. Large contributions to the thermal expansivities due to O-ordering are found for x ~ 6.95, which disappear below a kinetic glass-like transition near room temperature. The kinetics at this glass transition is governed by an energy barrier of 0.98 +- 0.07 eV, in very good agreement with other O-ordering studies. Using thermodynamic arguments, we show that O-ordering in the Y123 system is particularly sensitive to uniaxial pressure (stress) along the chain axis and that the lack of well-ordered chains in Nd123 and La123 is most likely a consequence of a chemical-pressure effect.
Meingast Christoph
Nagel Peter
Pasler Volker
Rykov Alexandre I.
Tajima Setsuko
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