Anisotropic uniaxial pressure effects in YBa2Cu3O7??
| Autor: | B. W. Veal, G. W. Crabtree, W. Nessler, S. Fleshler, M. Grimsditch, Ulrich Welp |
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| Rok vydání: | 1994 |
| Předmět: |
Superconductivity
Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Transition temperature Fermi level Fermi energy Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials symbols.namesake Electrical resistivity and conductivity symbols Orthorhombic crystal system Anisotropy |
| Zdroj: | Journal of Superconductivity. 7:159-164 |
| ISSN: | 1572-9605 0896-1107 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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