Raman scattering study of CeRhAs

Temperature dependence of Raman scattering spectra of Kondo insulator CeRhAs has been measured. With decreasing temperature, the phonon peaks split into doublet and triplet at about <f>370 K</f> and below <f>165 K</f>, respectively. The splitting is caused by a zone-folding due to the lattice modulations. The temperature dependence of the background intensity below <f>70 cm−1</f> is well explained by the resonance level model with V-shaped gap. [Copyright &y& Elsevier]