Effect of uniaxial pressure on the superconducting transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Raju P. GuptaCentre d’Etudes de Saclay, Département d’Etudes du Comportement des Matériaux, Section de Recherches de Métallurgie Physique, 91191 Gif-sur-Yvette Cedex, FranceMichèle GuptaCentre d’Etudes de Saclay, Département d’Etudes du Comportement des Matériaux, Section de Recherches de Métallurgie Physique, 91191 Gif-sur-Yvette Cedex, France
1994lv
ABI
Аннотация
The changes in the hole carrier concentrations in ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ are calculated for uniaxial compressions. We find that while a compression along the a axis enhances the hole density, the one along the b axis results in an almost equal decrease. Due to this cancellation, the pressure dependence of ${\mathit{T}}_{\mathit{c}}$ under a hydrostatic pressure is essentially the same as for a uniaxial stress along the c axis. A qualitative discussion is also given of the strikingly different behavior in ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{4}$${\mathrm{O}}_{8}$ which is attributed to the chain-chain interaction in this compound.
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