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Author Clinton, T. W. ♦ Liu, W. ♦ Jiang, X. ♦ Smith, A. W. ♦ Rajeswari, M. ♦ Greene, R. L. ♦ Lobb, C. J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ YTTERBIUM OXIDES ♦ THERMOELECTRIC PROPERTIES ♦ BARIUM OXIDES ♦ COPPER OXIDES ♦ HIGH-TC SUPERCONDUCTORS ♦ MIXED STATE ♦ SEEBECK EFFECT ♦ NERNST EFFECT ♦ HALL EFFECT ♦ ENTROPY ♦ MAGNETIC FIELDS ♦ TEMPERATURE DEPENDENCE ♦ TRANSPORT PROCESSES ♦ FLUX FLOW
Abstract We have studied the role of pinning in the mixed-state thermomagnetic transport properties of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. We demonstrate the pinning independence of the transport entropy {ital S}{sub {phi}}, and its consequent scaling within an anisotropic mass model. Due to the anisotropy of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} the extrinsic pinning strength effectively decreases as we rotate the magnetic field into the {ital ab} plane. The Nernst ({ital E}{sub {ital y}}/{nabla}{sub {ital xT}}) and Seebeck ({ital E}{sub {ital x}}/{nabla}{sub {ital xT}}) effects are enhanced as we reduce the effective pinning, yet the transport entropy {ital S}{sub {phi}}{proportional_to}({ital E}{sub {ital y}}/{nabla}{sub {ital xT}})/{rho}{sub {ital xx}}, the ratio of the Nernst and Seebeck signals, and the ratio of Seebeck and longitudinal resistivity {rho}{sub {ital xx}} are {ital unchanged}, similar to the pinning independence observed for the Hall conductivity {sigma}{sub {ital xy}}. These results can be explained within a simple phenomenological model of vortex dynamics. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-10-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 14


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