Abstract
A thermodynamic and transport study of as a function of temperature and magnetic field is presented. The central results include a growing specific heat with increasing field , a magnetic contribution to at low temperatures proportional to , an abrupt jump and a peak in at and for plane and axis, respectively, and corresponding changes in the low- power laws of the resistivity. The novelty of this work lies in the fact that this system is strongly anisotropic displaying spontaneous ferromagnetism along the axis and an intralayer metamagnetic transition with a possibility of a nearby quantum critical point. The exotic behavior reflects new physics that is yet to be understood.
- Received 23 October 2006
DOI:https://doi.org/10.1103/PhysRevB.75.024429
©2007 American Physical Society