Transport and magnetic behavior under pressure and high-resolution photoemission studies of Ce₂Rh_0.7Co_0.3Si₃, an alloy on the verge of quantum critical point

Abstract

We report the influence of external pressure on the temperature dependence of magnetization and electrical resistivity as well as high-resolution photoemission studies for an alloy, Ce₂Rh_0.7Co_0.3Si₃, ordering magnetically below 3 K. It is found that external pressure has the same effect as that induced by (further) Co substitution for Rh in the series, Ce₂Rh_1-xCo_xSi₃, resulting in qualitative changes in the features in the magnetic and transport data, with a suppression of magnetic ordering followed by quantum critical point effect. The high-resolution photo-emission spectra reveal signature of Kondo feature even at ambient pressure. These findings support the validity of spin-density-wave picture in this series.