Fermi-liquid instability of CeRh2Si2 near a pressure-induced quantum phase transition
Abstract
The electrical resistivity of single crystalline CeRh2Si2 has been measured at high pressure up to 8 GPa, and low temperature down to 2.0 K for the current along the a and c axes. Two magnetic phase transitions TN1=35 K and TN2=24 K at ambient pressure were observed as a function of pressure. It is found that both transitions TN1 and TN2 are suppressed by applying pressure and disappear near the critical pressure at PC1∼1.0 GPa and PC2∼0.6 GPa, respectively. The transition for TN1 is second order and the one for TN2 is first order. The resistivity shows T2 dependence at low temperature in a wide pressure range from ambient pressure up to 8 GPa, indicating that a Fermi liquid state still exists near PC1 and PC2. According to the comparison between the coefficient of T2 term and the Sommerfeld coefficient γ, however, it is suggested that the enhancement of many-body dynamical effect occurs near the critical pressure PC1∼1.0 GPa. These results are discussed on the basis of the pressure-induced quantum phase transition.
- Publication:
-
Physical Review B
- Pub Date:
- October 2003
- DOI:
- 10.1103/PhysRevB.68.144428
- Bibcode:
- 2003PhRvB..68n4428O
- Keywords:
-
- 75.20.Hr;
- 73.43.Nq;
- 74.62.Fj;
- Local moment in compounds and alloys;
- Kondo effect valence fluctuations heavy fermions;
- Quantum phase transitions;
- Pressure effects