Anisotropic upper critical fields of disordered Nb/sub 0. 53/Ti/sub 0. 47/-Ge multilayers

Technical Report · Tue Jul 01 04:00:00 EDT 1986

OSTI ID:6478064

Jin, B Y; Ketterson, J B; McNiff, Jr, E J; Foner, S; Schuller, I K

We report studies of the upper critical fields of Nb/sub 0.53/Ti/sub 0.47/-Ge multilayers consisting of thick Ge layers and varying thickness Nb/sub 0.53/T/sub 0.47/ layers. Both the angular dependence and the temperature dependence of the upper critical fields indicate a dimensional crossover at a Nb/sub 0.53/Ti/sub 0.47/ layer thickness near 200/angstrom/. All the 2D samples display a cusp-like upper critical field angular dependence with a sharper cusp for thinner Nb/sub 0.53/Ti/sub 0.47/ layers. The parallel upper critical fields are tentatively fitted with an expression combining the 2D field dependence of Rickayzen, the paramagnetic limiting behavior of Maki and the disorder-related Coulomb interaction effects of Maekawa and Fukuyama. The perpendicular fields are fitted with the Maekawa, Ebisawa and Fukuyama theory; better agreement is obtained for thinner Nb/sub 0.53/Ti/sub 0.47/ sublayers when the paramagnetic limiting effect is included. 24 refs., 7 figs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6478064
• Report Number(s): ANL/PPRNT-89-113; ON: DE89008434
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
CRITICAL FIELD
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EQUATIONS
GERMANIUM
LAYERS
MAGNETIC FIELDS
MATHEMATICAL MODELS
METALS
NIOBIUM
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TITANIUM
TRANSITION ELEMENTS