Tunneling measurements of ultrathin superconducting Ga films in high magnetic fields

Journal Article · Fri Mar 31 23:00:00 EST 1978 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.17.2915· OSTI ID:5005230

Maservey, R; Tedrow, P M; Bruno, R C

Tunneling measurements in magnetic fields up to 15 T were made on Ga films about 100 A thick deposited at T approx. = 1 K. The values of the spin-orbit scattering parameter b equivalent h/3tau/sub so/..delta.. and the orbital depairing parameter zeta were determined for as-deposited amorphous films and for polycrystalline films obtained by annealing at T approx. = 77 K. The tunneling conductance agreed closely with predictions of the theory of Maki and Fulde. For the best Ga-film tunnel junction a value of b = 0.2 +- 0.02 was obtained and this value did not change significantly during annealing, even though the resistively determined transport scattering time increased by a factor of 7.8 during annealing. Orbital depairing was found to follow a relation zeta = zeta/sub 0/ + ..cap alpha..H/sup 2/ and to increase with annealing in a manner expected from the change in mean free path determined from measurements of H/sub cnu/.

• Research Organization: Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• OSTI ID: 5005230
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 17:7; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
CRITICAL FIELD
ELEMENTS
FILMS
GALLIUM
HEAT TREATMENTS
JOSEPHSON JUNCTIONS
MAGNETIC FIELDS
METALS
SUPERCONDUCTING FILMS
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
TUNNEL EFFECT
TYPE-I SUPERCONDUCTORS