Abstract
The transverse magnetoresistance of at 1.2 K shows a large non-Ohmic reduction as a function of electric field for magnetic fields in the range 50–230 kG. The magnetoresistance data in the temperature range 1.2–43 K has been fitted to a Zener-tunneling model of the form σ=(H)+(1-/E)exp( -/E) and gives a value of =0.47 V/cm and =0.066 V/cm at 1.2 K and 206 kG for a crystal with a residual resistance ratio of 145. At 206 kG follows a temperature dependence of the form (T)=(0)exp(-T/Δ) with Δ/=15.2 K. The threshold electric field for charge-density-wave (CDW) motion is reduced at high magnetic fields and low temperatures while the magnetoresistance behavior suggests that the CDW structure below 59 K is strongly coupled to the magnetic field.
- Received 20 December 1984
DOI:https://doi.org/10.1103/PhysRevB.32.537
©1985 American Physical Society