Resistivity of Ce(Ru1−Rh )2Si2 under pressure

Abstract Resistivity measurement on single-srystalline Ce(Ru0.85Rh0.15)2Si2 sample, which shows a spin-density-wave (SDW) transition at a Neel temperature T N =5.5 K , has been performed with excitation current parallel to tetragonal a-axis under hydrostatic pressure. Resistivity shows an inflection around TN, although a hump-type anomaly is not observed as in the case for the c-axis. This inflection shifts to lower temperature with increasing pressure. This result indicates that the gap of Fermi surface is open only along the c-axis direction up to Pc. On the other hand, the shoulder corresponding to the Kondo effect exists around T∼20 K , and shifts to higher temperature with increasing pressure, indicating an increase of TK. This is consistent with the result for the c-axis.