Thermoelectric and thermomagnetic effects in the mixed state of high-Tc superconducting Tl2Ba2CaCu2Ox
G. Yu. Logvenov, M. Hartmann, R. P. Huebener
DOI 10.1103/PhysRevB.46.11102 · Physical Review B
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Abstract
We have measured the longitudinal thermoelectric effects (Seebeck and Peltier effect) and the transverse thermomagnetic effects (Nernst and Ettingshausen effect) in the mixed state of the same Tl2Ba2CaCu2Ox single crystal. The longitudinal effects were found to be in agreement with the behavior expected from the diffusion of quasiparticles in a temperature gradient or electric field, and consistency with the Thomson relation was observed. The Nernst effect showed the qualitative behavior expected from the thermal diffusion of vortices in a temperature gradient. For the Tl2Ba2CaCu2Ox single crystal we obtain a value of the transport entropy of Scphi=0.3×10−15 J/K m at B=1 T. The transport entropy Scphi derived from the Nernst-effect measurements showed the reduction expected for B∥c for a highly anisotropic material, where the standard Abrikosov vortices degenerate into ‘‘pancake vortices’’ confined to the CuO2 sheets. Because of this reduction of Scphi, the Ettingshausen effect was below the detection limit of our experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Tl2Ba2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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