Thermally activated resistive behavior and flux motion in La[sub 2[minus][ital x]]Sr[sub [ital x]]CuO[sub 4] single-crystal thin films

Journal Article · Tue Dec 01 00:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.14230· OSTI ID:6889915

Suzuki, M ^[1]

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1. NTT Interdisciplinary Research Laboratories, Nippon Telegraph and Telephone Corporation, 162 Tokai, Ibaraki 319-11 (Japan)

Thermally activated behavior of the resistive transition under magnetic fields has been studied in La[sub 2[minus][ital x]]Sr[sub [ital x]]CuO[sub 4] ([ital x]=0.1, 0.15, 0.2, and 0.3) single-crystal thin films. It is found that the resistivity [rho] below [ital T][sub [ital c]] scales as [rho]([ital T])=[rho][sub 0]exp[l brace][minus][ital U][sub 0][1[minus][ital T]/[ital T][sub [ital c]]([ital H])][sup [ital n]]/[ital k][sub [ital B]T][r brace], where [ital n]=3 for [bold H][parallel][bold c] and [ital n]=2.5 for [bold H][perpendicular][bold c]. This behavior is explained phenomenologically as the thermal-depinning of vortices in quasi-two-dimensional superconductors having small-sized dense point pins. Numerical fitting provides values for the effective pinning potential and the mean-field upper critical field, which delineates straight [ital H]-[ital T] phase boundaries.

• OSTI ID: 6889915
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 46:21; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER OXIDES
ELECTRIC CONDUCTIVITY
LANTHANUM OXIDES
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
CRITICAL FIELD
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
FILMS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
665411* - Basic Superconductivity Studies- (1992-)