Abstract
We have measured the high field transverse magnetoresistance and magnetization on single crystalline samples of with the applied magnetic field both parallel and perpendicular to the c axis of the tetragonal crystal structure. At high temperatures, the magnetoresistance is negative with a magnitude that increases as the temperature is lowered. A scaling analysis of the data for finds a characteristic energy that is ∼20 K at low temperatures, which is a factor of 2 larger than the Kondo temperature determined from thermodynamic measurements, and it increases linearly with the temperature. Even though the magnetoresistance for is also negative, the data do not scale. At low temperatures, the magnetoresistance is very anisotropic. In the Fermi-liquid regime below ∼1.6 K, the resistivity has a temperature-independent contribution due to ligand and/or Kondo-hole disorder and a term from electron-electron scattering that goes like For the residual resistivity and the coefficient are field dependent. Both the high- and low-temperature data are compared to various theoretical calculations.
- Received 22 October 1998
DOI:https://doi.org/10.1103/PhysRevB.60.8012
©1999 American Physical Society