Electron localization and superconducting fluctuations in quasi-two-dimensional Ti films

Journal Article · Sun Oct 15 04:00:00 EDT 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.7594· OSTI ID:5487338

Vangrunderbeek, J; Van Haesendonck, C; Bruynseraede, Y ^[1]

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1. Laboratorium voor Vaste Stof-Fysika en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3030 Leuven, Belgium (BE)

Detailed measurements of the low-temperature variation of the resistance as a function of temperature and magnetic field are reported for sputtered Ti films with a thickness ranging from 8 to 100 nm. At low temperatures, the films showed a quasi-two-dimensional electronic behavior which can be described in terms of disorder-enhanced electron-electron interaction and weak electron localization in the presence of spin-orbit and magnetic scattering. Below 4.2 K, the inelastic scattering is dominated by the electron-electron interaction. Superconducting fluctuations are clearly observed in the thicker films and the extrapolated {ital T}{sub {ital c}} decreases rapidly with increasing film resistivity. This is in agreement with a disorder-induced broadening of the density-of-states peak near the Fermi level. For the thicker films, the presence of a Kondo effect also has to be invoked to explain the temperature dependence of the resistance.

• OSTI ID: 5487338
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:11; ISSN PRBMD; ISSN 0163-1829
• 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
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-ELECTRON COUPLING
ELEMENTS
FLUCTUATIONS
INELASTIC SCATTERING
KONDO EFFECT
MAGNETIC FIELDS
METALS
PHYSICAL PROPERTIES
SCATTERING
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TITANIUM
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE
VARIATIONS