Abstract
We have measured the specific heat of pure and thoriated (3.3% thorium) in the temperature interval 0.3–1.8 K in applied magnetic fields up to 20 T, and find striking qualitative differences between the two systems. For pure the electronic coefficient of specific heat is noticeably suppressed by a field of 20 T at 1.8 K; below 1 K, however, this reduction from the low-field, normal-state value tends to zero. For the 3.3% thoriated sample, the high-temperature value of is relatively insensitive to strong magnetic fields, but at lower temperatures the suppression of becomes much stronger, reaching nearly 40% at 0.35 K in a field of 20 T. This behavior is similar to that observed in most cerium-based heavy-fermion systems.
- Received 14 August 1989
DOI:https://doi.org/10.1103/PhysRevB.40.9358
©1989 American Physical Society