Chemical pressure analysis (CPA): yttrium, bismuth, thallium, and mercury based high-temperature superconductors
Chemical pressure analysis (CPA) is used to determine the anisotropic dependence of the critical temperature on the lattice parameters of Bi2Sr2CaCu2O8 + x. CPA yields a quantitative expression relating Tc and lattice parameter values and offers a phenomenological approach to studying the effect of structure on superconductivity. Similar to previously reported results for YBa2Cu3O7 - x and YBa2(Cu1 - xFex)3O7 - y, CPA for Bi2Sr2CaCu2O8 + x reveals that the dependence of the critical temperature is strongly anisotropic and is influenced much more by chemical pressure than by physical (mechanical) pressure, per unit change in lattice parameter. A positive correlation is found between unit cell volume and Tc for Bi2Sr2CaCu2O8 + x, but these parameters are negatively correlated for YBa2Cu3O7 - x and YBa2(Cu1 - xFex)3O7 - y. Physical pressure results for both Tl2Ba2CaCu2Ox and HgBa2Cam - 1CumO2m + 2 + δ indicate that increases of up to 28 K (10 GPa) and 30 K (45 GPa), respectively, can be obtained from these compounds, but sufficient lattice constant and elastic constant data for CPA are not yet available. © 1995.
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Related Subject Headings
- Materials
- 4016 Materials engineering
- 1007 Nanotechnology
- 0912 Materials Engineering
- 0303 Macromolecular and Materials Chemistry
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Materials
- 4016 Materials engineering
- 1007 Nanotechnology
- 0912 Materials Engineering
- 0303 Macromolecular and Materials Chemistry