Abstract
We present measurements of the uniaxial pressure dependence ofT c of untwinned YBa2Cu3O7−δ crystals with various oxygen stoichiometries. For all samples investigated,T c decreases for pressure alonga, increases for pressure alongb, and, in oxygen deficient samples, increases strongly for pressure alongc. These results are compared to the behavior found in the La2−x Sr x CuO4 and YBa2Cu4O8 systems. Neither the model of pressure-induced charge transfer nor coupling to orthorhombic distortions can explain all the data. However, the presence of singularities in the electronic density of states close to the Fermi energy is a possible origin of the observed behavior. Our preliminary data on the pressure dependence of thec-axis and in-plane resistivities in twinned crystals are consistent with this view.
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Welp, U., Grimsditch, M., Fleshler, S. et al. Anisotropic uniaxial pressure effects in YBa2Cu3O7−δ . J Supercond 7, 159–164 (1994). https://doi.org/10.1007/BF00730387
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DOI: https://doi.org/10.1007/BF00730387