Abstract
has the structure and its ion is in a low spin configuration with =. In this paper, we report results of our study on single-crystal Magnetic susceptibility and isothermal magnetization display weak ferromagnetism below 240 K with an easy axis along the axis and a spin reorientation transition in low magnetic fields. Both the effective paramagnetic moment and the saturation moment are found to be quite small, but the ratio of (=3.5) qualitatively fits the Rhodes-Wohlfarth plot. Resistivity, along two principal crystallographic directions is strongly anisotropic and shows a metallic behavior below 120 K. exhibits strikingly nonlinear conductivity, i.e., a current-controlled negative differential resistivity for K. The origin of the nonohmic behavior may be associated with charge-density-wave depinning. Unlike other systems such as ruthenates appears to show no correlation between conductivity and magnetism.
- Received 9 January 1998
DOI:https://doi.org/10.1103/PhysRevB.57.R11039
©1998 American Physical Society