Conductivity anisotropy and transverse magnetoresistance of NbSe/sub 3/

Journal Article · Wed Nov 15 04:00:00 EST 1978 · Phys. Rev., B: Solid State; (United States)

DOI:https://doi.org/10.1103/PhysRevB.18.5265· OSTI ID:6516849

Ong, N P; Brill, J W

The first-transverse dc conductivity measurements on a member of the transiton-metal trichalcogenides (NbSe/sub 3/) are presented. The conductivity anisotropy sigma/sub b//sigma/sub c/ (where b is the chain axis) was obtained using the Montgomery technique, and varies from 10 to 20 as a function of temperature. The transverse resistivity rho/sub c/ also shows anomalies associated with the charge-density-wave transitions at T/sub 1/ (142 K) and T/sub 2/ (58 K). However, these anomalies are smaller than the corresponding ones in rho/sub b/. The quantity R/sub H/(0)/(rho/sub b/ rho/sub c/), where R/sub H/ is the Hall constant, demonstrates explicitly the freeze-out of thermally excited quasiparticles below each transition. We show that at both transition gaps appears on the hole surface, and the hole concentration decreases rapidly. The transverse magnetoresistance at low fields has also been measured. Its monotonic power-law decrease with increasing temperature shows explicitly that the resistivity anomalies are due to changes in the carrier concentration, and not in the lifetimes.

• Research Organization: Department of Physics, University of Southern California, Los Angeles, California 90007
• OSTI ID: 6516849
• Journal Information: Phys. Rev., B: Solid State; (United States), Journal Name: Phys. Rev., B: Solid State; (United States) Vol. 18:10; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ANISOTROPY
CHALCOGENIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LOW TEMPERATURE
MAGNETORESISTANCE
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
PHYSICAL PROPERTIES
SELENIDES
SELENIUM COMPOUNDS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS