Temperature dependences of the Hall and magnetoresistance coefficients of vanadium and tantalum single crystals: Anisotropy of electron-phonon scattering

Journal Article · Mon Jul 01 04:00:00 EDT 1985 · Sov. Phys. - JETP (Engl. Transl.); (United States)

OSTI ID:6303727

Volkenshtein, N V; Veprev, A G; Startsev, V E; Cherepanov, A N; Cherepanov, V I

The Hall coefficient R/sub H/(T), transverse magnetoresistance rho/sub c/(T), and the temperature-dependent component rho/sub c/(T) of the impurity electrical resistance are measured as functions of temperature T = 4.2--300 K for vanadium and tantalum single crystals with rho/sub 273.2//rho/sub 4.2/ = 1350 and 500, respectively. The curves R/sub H/(T) have minima at T0 = 33 and 24 K for vanadium and tantalum, respectively, which indicates that the electron-phonon scattering is anisotropic. The anisotropy is caused by ''intersheet'' electron-phonon processes in which the charge carriers are scattered between the open hole surface GAMMAH3h and the closed hole ellipsoids N3h. The curves r/sub H/(T) and rho/sub c/(T) have maxima for T close to T0. The observed extrema have a common physical origin and can be explained by the Kagan-Zhernov-Flerov theory, which postulates that the nonequilibrium part of the electron distribution function is anisotropic. The observed dependence R/sub H/(T) for T>T0 agrees with calculations of R/sub H/(T) for vanadium based on realistic models for the electron and phonon spectra, including the anisotropy for the electron-phonon interaction matrix element.

• Research Organization: Institute of Metal Physics, Ural Science Center, Academy of Sciences of the USSR, and S. M. Kirov Ural Polytechnic Institute, Sverdlovsk
• OSTI ID: 6303727
• Journal Information: Sov. Phys. - JETP (Engl. Transl.); (United States), Journal Name: Sov. Phys. - JETP (Engl. Transl.); (United States) Vol. 62:1; ISSN SPHJA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ANISOTROPY
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
ELEMENTS
HALL EFFECT
LOW TEMPERATURE
MAGNETORESISTANCE
MEDIUM TEMPERATURE
METALS
MONOCRYSTALS
PHYSICAL PROPERTIES
TANTALUM
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE
VANADIUM
VERY LOW TEMPERATURE