TY - JOUR

T1 - Unusual magnetic-field dependence of the electrothermal conductivity in the mixed state of cuprate superconductors

AU - Clayhold, J.

AU - Xue, Y.

AU - Chu, C.

AU - Eckstein, J.

AU - Bozovic, I.

PY - 1996

Y1 - 1996

N2 - In the mixed state of a superconductor, the electrothermal conductivity, P, which measures the electrical current density produced by a thermal gradient, is supposed to be independent of both the magnetic field and the details of the vortex motion. Measurements of the thermopower and resistivity in (Formula presented)(Formula presented)(Formula presented), (Formula presented)(Formula presented)(Formula presented)(Formula presented), and (Formula presented)(Formula presented)(Formula presented)(Formula presented) show an unusual, sharp structure in P at low field. In (Formula presented)(Formula presented)(Formula presented)(Formula presented), the extra contribution is negative, causing a sign change of the thermopower versus applied magnetic field. The possible origins of the low-field anomaly are discussed.

AB - In the mixed state of a superconductor, the electrothermal conductivity, P, which measures the electrical current density produced by a thermal gradient, is supposed to be independent of both the magnetic field and the details of the vortex motion. Measurements of the thermopower and resistivity in (Formula presented)(Formula presented)(Formula presented), (Formula presented)(Formula presented)(Formula presented)(Formula presented), and (Formula presented)(Formula presented)(Formula presented)(Formula presented) show an unusual, sharp structure in P at low field. In (Formula presented)(Formula presented)(Formula presented)(Formula presented), the extra contribution is negative, causing a sign change of the thermopower versus applied magnetic field. The possible origins of the low-field anomaly are discussed.

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U2 - 10.1103/PhysRevB.53.8681

DO - 10.1103/PhysRevB.53.8681

M3 - Article

AN - SCOPUS:0042308086

SN - 1098-0121

VL - 53

SP - 8681

EP - 8686

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 13

ER -