Uniaxial pressure dependence of Tc of untwinned YBa2Cu3Ox single crystals for x=6.5–7
| Autor: | A. Erb, H. Claus, Christoph Meingast, G. Bräuchle, German Müller-Vogt, H. Wühl, O. Kraut |
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| Rok vydání: | 1993 |
| Předmět: |
chemistry.chemical_classification
High-temperature superconductivity Materials science Condensed matter physics Energy Engineering and Power Technology Condensed Matter Physics Uniaxial pressure Thermal expansion Electronic Optical and Magnetic Materials law.invention chemistry law Orthorhombic crystal system Transfer model Electrical and Electronic Engineering Anisotropy Inorganic compound Single crystal |
| Zdroj: | Physica C: Superconductivity. 205:139-146 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(93)90180-x |
| Popis: | The dependence of Tc on uniaxial pressure dTc/dpi(i= a, b, c) is determined for untwinned YBa2Cu3Ox single crystals as a function of O-content using ultrahigh-resolution thermal-expansion data and the Ehrenfest relationship. The dTc/dpi values are found to be highly anisotropic and are likely due to several different effects. For uniaxial-pressure applied parallel to the c-axis, we find a strong O-content (or carrier density) dependence of the dTc/dpb values, which have opposite signs charge transfer model. This model does not, however, explain the large dTc/dpa and dTc/dpb values, which have opposite signs and do not show a strong O-content dependence except at x=6.7, where both dTc/dpa and dTc/dpb values increase sharply. The a, b effects are discussed in terms of the orthorhombic distortion. |
| Databáze: | OpenAIRE |
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