Thermal Conductivity of USb2 and UBi2 Single Crystals

Ryszard Wawryk (1) , Jan Mucha (1) , Halina Misiorek (1) , Zygmunt Henkie (1)

1 Institute of Low Temperature and Structure Research [Polish Academy of Sciences]

The thermal conductivity (k) of single crystals of tetragonal uniaxial antiferromagnets USb2 (TN = 202 K) and UBi2 (TN = 180.8 K) has been measured along the a-axis (ka) over the temperature range from 0.5 K to 300 K and along the c-axis (kc) from 0.5 K to 70 K. The as-grown samples have RRR values of about 500 – 600 and 100 – 150 for UBi2 and USb2, respectively. The anisotropy of the thermal conductivity (ka(T)/kc(T) ~ 5) and the low-T Lorenz ratios are discuss in relation to Fermi surface topology for both compounds.

Mots clés: Physical Sciences

Ryszard Wawryk, Jan Mucha, Halina Misiorek, Zygmunt Henkie. Thermal Conductivity of USb2 and UBi2 Single Crystals. Philosophical Magazine, 2010, 90 (06), pp.793-801. ⟨10.1080/14786430903292399⟩. ⟨hal-00562293⟩