Anisotropic and thermally activated resistive behavior in Nd sub 1. 85 Ce sub 0. 15 CuO sub 4 minus. delta

Journal Article · Tue May 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.9566· OSTI ID:6883808

Suzuki, M; Hikita, M ^[1]

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1. NTT Opto-Electronics Laboratoires, Nippon Telegraph and Telephone Corporation, 162 Tokai-mura, Ibaraki-ken 319-11, (Japan)

An anisotropic-field-induced resistive transition has been measured for highly {ital c}-axis-oriented Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4{minus}{delta}} thin films as a function of a magnetic field {bold H} parallel and perpendicular to the {ital c} axis. It is found that the observed resistivity {rho} below {ital T}{sub {ital c}} scales as {rho}({ital T})={rho}{sub 0} exp{l brace}{minus}{ital U}({ital H})(1{minus}{ital T}/{ital T}{sub {ital c}}({ital H})){sup {ital n}}/{ital k}{sub {ital B}T}{r brace} with {ital n}=2 for {bold H}{perpendicular}{bold c} and {ital n}=3 for {bold H}{parallel}{bold c}. This resistive behavior is explained by thermally activated flux motion based on a depinning model for flux lines in a quasi-two-dimensional superconductor. Numerical fitting leads to an estimation of the upper critical field, which results in a straight {ital H}-{ital T} phase boundary in quite a wide range below {ital T}{sub {ital c}} with upward deviation at lower temperatures.

• OSTI ID: 6883808
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 41:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM OXIDES
CRITICAL FIELD
ELECTRIC CONDUCTIVITY
COPPER OXIDES
NEODYMIUM OXIDES
ANISOTROPY
LOW TEMPERATURE
MAGNETIC FLUX
MEDIUM TEMPERATURE
SCALING LAWS
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
CERIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
FILMS
MAGNETIC FIELDS
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
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360204* - Ceramics
Cermets
& Refractories- Physical Properties