Role of the density-of-states superconducting fluctuations in the in-plane and out-of-plane transport properties of Bi₂Sr₂CaCu₂O_8+x single crystals

Autor(en)

G. Heine, W. Lang, X. L. Wang, S. X. Dou

Abstrakt

We report transverse (B perpendicular to j) and longitudinal (B||j) in-plane (j||ab-plane) and out-of-plane (j||c-axis) magnetoresistance measurements on underdoped, optimally doped and overdoped Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+x/ single crystals. The measurements were performed in the temperature range from slightly above T/sub c/ to 200 K and in magnetic fields up to 13 T. The in-plane magnetoresistance (MR) is positive for all temperatures, magnetic fields and different doping levels. Near T/sub c/, the in-plane MR is dominated by thermodynamic fluctuations, but at higher temperatures a smooth transition to the MR of normal-state quasiparticles takes place. In sharp contrast, the out-of-plane MR is negative for all temperatures and orientations of the magnetic field. We interpret this unconventional behaviour in the framework of the superconducting fluctuation theory, taking into account different weights of the Aslamazov-Larkin and single-carrier density-of-states contributions.

Organisation(en)

Elektronische Materialeigenschaften

Journal

Physica C: Superconductivity and its Applications

Band

317-318

Seiten

596-599

Anzahl der Seiten

4

ISSN

0921-4534

DOI

https://doi.org/10.1016/S0921-4534(99)00139-2

Publikationsdatum

1999

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/3c0c901e-649a-46c7-8a58-3851009464e6