Thermoelectric power of inhomogeneous superconductors: Effects of field-induced intragrain granularity

S. Sergeenkov; M. Ausloos

doi:10.1103/PhysRevB.47.14476

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Thermoelectric power of inhomogeneous superconductors: Effects of field-induced intragrain granularity

S. Sergeenkov, M. Ausloos

DOI 10.1103/PhysRevB.47.14476 · Physical Review B

T1

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Abstract

The temperature, magnetic-field, and oxygen-deficiency dependence of the thermoelectric power (TEP), S, of an inhomogeneous superconductor with field-induced intragrain granularity is considered via the superconductive-glass model. Below the phase-locking (grain-decoupling) temperature Tg, which defines the coherent properties of a Josephson-junction network, the TEP follows a linear T dependence, while above Tg (but below the single-superconducting-grain-depairing temperature Tc), S shows a semiconductorlike 1/T behavior. The model predicts the existence of a maximum of S near Tg that increases with the applied magnetic field and changes its sign above some threshold value of the oxygen-deficiency parameter. Attributing the intragrain granularity to clusters of oxygen defects (in the CuO plane), the calculated TEP behavior is found to be in qualitative agreement with the experimentally observed (below Tc) anomalous peak of the magneto-TEP in oxygen-deficient high-Tc superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown