Magnetoconductance of Tl sub 2 Ba sub 2 CaCu sub 2 O sub x films in the fluctuation regime
Journal Article
·
· Physical Review, B: Condensed Matter; (USA)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (US)
Magnetoconductance (MC) has been measured above the mean-field transition temperature {ital T}{sub {ital c}} in the highly anisotropic high-temperature superconductor Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub {ital x}} for fields parallel and perpendicular to the CuO plane. Recent theoretical expressions for the magnetoconductance in the layered superconductors provide a good fit for the temperature range {ital T}{sub {ital c}}+10 K{lt}{ital T}{lt}160 K. Using the additional constraint of the zero-field fluctuation conductivity, we obtain the in-plane coherence length {xi}{sub {ital a}{ital b}}(0){approx}11.8{plus minus}0.4 A and a linear temperature dependence for the phase relaxation rate, with 1/{tau}{sub {phi}}{approx}(3.5{plus minus}0.5){times}10{sup 13} sec{sup {minus}1} at {ital T}{sub {ital c}}. For {ital T}{sub {ital c}}{lt}{ital T}{lt}{ital T}{sub {ital c}}+10 K, we found a significant enhancement of the negative MC compared to the prediction based on the Gaussian approximation. A possible origin of such deviation is discussed.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5845039
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:4; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
MAGNETORESISTANCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
MAGNETORESISTANCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VARIATIONS