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 · Mon Nov 30 23:00:00 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), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:21; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

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