Upper critical field of V-Ag multilayered superconductors
We report investigations of the upper critical field (H/sub c//sub 2//sub perpendicular/ and H/sub c//sub 2//sub X/) of V-Ag proximity-coupled superconducting multilayer structures, prepared by ultrahigh-vacuum electron-beam evaporation. By means of x-ray diffraction analysis, successful formation of an artificial superstructure is confirmed. From resistivity measurement parallel to the layers, the electron mean free paths in the V and Ag layers are determined. With reference to these transport properties, characterization of H/sub c//sub 2/ has been made. For three-dimensional multilayer structures, H/sub c//sub 2/ is analyzed in terms of the temperature dependence of H/sub c//sub 2//sub perpendicular/, the zero-temperature coherence length, and the anisotropy H/sub c//sub 2//sub X//H/sub c2//sub perpendicular/. Our results are in quantitative agreement with the relevant theories. For quasi-two-dimensional multilayer structures, a peculiar temperature dependence has been revealed in both H/sub c//sub 2//sub perpendicular/ and H/sub c//sub 2//sub X/. H/sub c//sub 2//sub perpendicular/ exhibits positive curvature near T/sub c/, and it is continuously enhanced with the increase of multilayer period, as predicted theoretically. In contrast with the monotonic variation in H/sub c//sub 2//sub perpendicular/, a drastic upturn at a certain temperature (dimensional crossover) and an upward inflection at a higher temperature have been observed in H/sub c//sub 2//sub X/. These two types of anomalies in H/sub c//sub 2//sub X/ are discussed in the context of the commensurability between the multilayer structure and the vortex lattice.
- Research Organization:
- Institute for Chemical Research, Kyoto University, Uji 611, Japan
- OSTI ID:
- 5924636
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 35:13
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
SILVER
CRITICAL FIELD
VANADIUM
ELECTRIC CONDUCTIVITY
ELECTRON BEAMS
EXPERIMENTAL DATA
LAYERS
MEAN FREE PATH
PROXIMITY EFFECT
SUPERLATTICES
TEMPERATURE DEPENDENCE
TYPE-II SUPERCONDUCTORS
ULTRAHIGH VACUUM
VAPOR DEPOSITED COATINGS
BEAMS
COATINGS
DATA
ELECTRICAL PROPERTIES
ELEMENTS
INFORMATION
LEPTON BEAMS
MAGNETIC FIELDS
METALS
NUMERICAL DATA
PARTICLE BEAMS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENTS
360104* - Metals & Alloys- Physical Properties
656100 - Condensed Matter Physics- Superconductivity