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The intermetallic compound LaAgSb2 displays two charge-density-wave (CDW)transitions, which were detected with measurements of electrical resistivity(rho), magnetic susceptibility, and X-ray scattering; the upper transitiontakes place at T1 approx. 210 K, and it is accompanied by a large anomaly inrho(T), whereas the lower transition is marked by a much more subtle anomaly atT2 approx. 185 K. We studied the effect of hydrostatic pressure (P) on theformation of the upper CDW state in pure and doped La1-xRxAgSb2 (R = Ce, Nd)compounds, by means of measurements of rho(T) for P < 23 kbar. We found thatthe hydrostatic pressure, as well as the chemical pressure introduced by thepartial substitution of the smaller Ce and Nd ions for La, result in thesuppression of the CDW ground state, e.g. the reduction of the orderingtemperature T1. The values of dT1/dP are approx. 2-4 times higher for theCe-doped samples as compared to pure LaAgSb2, or even La0.75Nd0.25AgSb2Nd-doped with a comparable T1 (P=0). This increased sensitivity to pressure maybe due to increasing Ce- hybridization under pressure. The magnetic orderingtemperature of the cerium-doped compounds is also reduced by pressure, and thehigh pressure behavior of the Ce-doped samples is dominated by Kondo impurityscattering.

Hydrostatic pressure study of pure and doped La1-xRxAgSb2 (R = Ce, Nd) charge-density-wave compounds