Thermal expansion of the Kondo insulator CeRhSbNolten, A.J.; de Visser, A.; Kayzel, F.E.; Franse, J.J.M.; Tanaka, H.; Takabatake, T.
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AbstractThe linear coefficients of thermal expansion, a(T), of the Kondo insulator CeRhSb and its non-f-electron analog LaRhSb have been measured on polycrystalline samples in the temperature range 1.5-200 K. After subtracting the phonon contribution (0 o = 260 K), the f-electron contribution to the thermal expansion, am(T), shows two distinct features, a broad maximum is centered at 125 K, while a large shoulder appears below 40 K. In a plot of t~., / T versus T, a maximum appears at the temperature where the energy gap opens, Tg = 10 K. For T < Tg, a.,(T) follows an aT + bT 2 law, which is compatible with a description of the energy gap vanishing on lines at the Fermi surface.