Upper critical field of V-Ag multilayered superconductors

Journal Article · Fri May 01 04:00:00 EDT 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.6736· OSTI ID:5924636

Kanoda, K; Mazaki, H; Hosoito, N; Shinjo, T

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), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:13; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAMS
COATINGS
CRITICAL FIELD
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON BEAMS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
LAYERS
LEPTON BEAMS
MAGNETIC FIELDS
MEAN FREE PATH
METALS
NUMERICAL DATA
PARTICLE BEAMS
PHYSICAL PROPERTIES
PROXIMITY EFFECT
SILVER
SUPERCONDUCTORS
SUPERLATTICES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
TYPE-II SUPERCONDUCTORS
ULTRAHIGH VACUUM
VANADIUM
VAPOR DEPOSITED COATINGS