Abstract
The thermal conductivity of single crystals of Ca, Mn, Co, and Zn has been measured over the temperature range from 3°K to 300°K. In this series, Ca and Zn are diamagnetic, whereas Mn and Co are antiferromagnetic. All four crystals have nearly equal thermal conductivities at room temperature, but differ at lower temperatures. Ca, which is nearly isotopically pure, exhibits an exponential rise in conductivity with decreasing temperature characteristic of umklapp processes. Zn shows only traces of such umklapp behavior because its conductivity is limited by isotope and impurity scattering. Small cusps are observed in the conductivities of Mn and Co at their Néel temperatures of 67°K and 38°K, respectively, which indicate the presence of phonon-magnon scattering. Some experimental details concerning thermal conductivity measurements and the behavior of gold-cobalt thermocouples are also given.
- Received 23 January 1961
DOI:https://doi.org/10.1103/PhysRev.122.1451
©1961 American Physical Society