Hydrostatic pressure study of single-crystalline UNi0.5Sb2

TitleHydrostatic pressure study of single-crystalline UNi0.5Sb2
Publication TypeJournal Article
Year of Publication2008
AuthorsDavis BK, Torikachvili MS, Mun ED, Frederick JC, Miller GJ, Thimmaiah S, Bud'ko SL, Canfield PC
Journal TitleJournal of Applied Physics
Date PublishedApr
Type of ArticleProceedings Paper
ISBN Number0021-8979
Accession NumberISI:000255043200267

We studied single crystals of the antiferromagnetic compound UNi0.5Sb2 (T-N approximate to 161 K) by means of measurements of magnetic susceptibility (chi), specific heat (C-p), and electrical resistivity (rho) at ambient pressure, and resistivity under hydrostatic pressures up to 20 kbars, in the temperature range from 1.9 to 300 K. The thermal coefficient of the electrical resistivity (d rho/dT) changes drastically from positive below T-N to negative above, reflecting the loss of spin-disorder scattering in the ordered phase. Two small features in the rho versus T data centered near 40 and 85 K correlate well in temperature with features in the magnetic susceptibility and are consistent with other data in the literature. These features are quite hysteretic in temperature, i.e., the difference between the warming and cooling cycles are about 10 and 6 K, respectively. The effect of pressure is to raise T-N at the approximate rate of 0.76 K/kbar, while progressively suppressing the amplitude of the small features in rho versus T at lower temperatures and increasing the thermal hysteresis. (c) 2008 American Institute of Physics.

Alternate JournalJ. Appl. Phys.