Critical magnetic fields of ultrathin bismuth films

Journal Article · Thu Sep 01 04:00:00 EDT 1977 · Sov. J. Low Temp. Phys. (Engl. Transl.); (United States)

OSTI ID:7097214

Lazarev, B G; Semenenko, E E; Tutov, V I

Critical transverse magnetic fields were measured in bismuth films 70 to 18 A thick. It was found that for the temperature range (5--1.8/sup 0/K) and fields investigated the relation H/sub C/(T) is linear in bismuth layers freshly condensed on a liquid-helium-cooled substrate. The slope dH/sub c//dT increases the film thickness decreases, attaining a value of 95,000 Oe/deg for the thinnest films. This increase is correlated with the increase in film resistivity, i.e., with the reduction in the mean free path of the conduction-band electrons. The value of the factor A obtained from the value of the critical magnetic field for a film about 20 A thick (H/sub C/ =Ax10/sup 4/ T/sub C/) is 9.5. Thus, in ultrathin bismuth films the critical magnetic field is much higher than the paramagnetic limit. This behavior is explained by the large spin--orbit scattering in freshly-deposited ultrathin bismuth films. When the thickness of the bismuth film decreases from 40 to 10 A, the density of states falls off by approximately a factor of two.

• Research Organization: Physicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Khar'kov
• OSTI ID: 7097214
• Journal Information: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States) Vol. 3:9; ISSN SJLPD
• 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
BISMUTH
CRITICAL FIELD
ELEMENTS
FILMS
MAGNETIC FIELDS
MEAN FREE PATH
METALS
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE