Quasiparticle contribution to the mixed-state thermopower in Tl2Ba2CaCu2O8 + δ

Clayhold, J. A.; Chu, C. W.

doi:10.1016/0022-3697(95)00095-x

Cited by 1 publication

(2 citation statements)

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“…In such a case, due to the constant and position independent vortex velocity » " , the voltage ¼ developed across the 3-4 contact pair ( Fig. 1) is proportional to the distance ¸ -according to ¼ J» L [3][4] . Since for high-¹ A materials the Hall angle " is very small [17], we neglect its influence and suppose hereafter that V "" J;B.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The latter process was found to contribute substantially to the transport properties of conventional (low-¹ A ) superconductors and to be of the same importance as the quansiparticle contribution. The situation in high-¹ A superconductor (HTS) materials, at least as far as the resistivity studies are concerned, but also for the cases of the thermoelectric power in a field [4,5] and the Nernst effect [5,6], is less clear. The quasiparticle contribution to dissipation, ¼ O , is expected to become especially significant in HTSs, provided that there exists [7] a nonvanishing quasiparticle density of states in the gap, , as for the d-wave symmetry gap.…”

Section: Introductionmentioning

confidence: 99%

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Influence of a non-uniform current density profile on quasiparticle excitations and thermally activated flux creep in YBa2Cu3O7−σ

Sergeenkov

Gridin

Ausloos

1996

Zeitschrift für Physik B Condensed Matter

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Abstract. The transport current density, flowing radially from the center of a superconducting disk to its perimeter, in a so-called Corbino geometry, results in a double action on the vortex motion when the applied magnetic field is perpendicular to the disk's plane. First, the depinned vortices are set into a nearly circular motion in the plane of the disk. Second, the non-uniform current density profile activates the intrinsic weak links, resulting in a non negligible proximity dominated quasiparticle contribution. In turn, these intrinsic junctions impede the circular motion of vortices giving rise to a proximity influenced thermally activated flux creep. This provides a simple technique to deconvolute the flux motion and the quasiparticle induced components of the total dissipative resistivity broadening below ¹ A . The case for a YBaCuO disk is hereby examined and measured in this context. It is shown that such a deconvolution can be made and theoretical laws for the field dependences are also obtained and confirm the data. Furthermore, the paraconductivity region just above ¹ A (B) appears to be dominated by the macroscopic fluctuations accompanying the vortex core motion.

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Section: Experimental Methodsmentioning

confidence: 99%