Abstract
We present data for the temperature and magnetic-field dependence of the specific heat, magnetic susceptibility, magnetization, and electrical resistivity of . The data demonstrate the scaling behavior of the thermodynamic quantities at temperatures up to 10 K and magnetic fields up to 14 T. The magnetic field scales as . The zero-field specific heat varies with temperature as -T lnT. The magnetic field strongly affects the thermodynamics, but the magnetoresistance is very small (-2% at T=0.36 K and H=14 T). We argue that our data are inconsistent with any single-impurity interpretation. We suggest that the system has a second-order phase transition at T=0.
- Received 19 July 1991
DOI:https://doi.org/10.1103/PhysRevLett.67.2886
©1991 American Physical Society