Pressure-tuned first-order phase transition and accompanying resistivity anomaly in CeZn1-δSb2
Abstract
The Kondo lattice system CeZn0.66Sb2 is studied by electrical resistivity and ac magnetic susceptibility measurements at several pressures. At P=0kbar , ferromagnetic and antiferromagnetic transitions appear at 3.6 and 0.8K , respectively. The electrical resistivity at TN dramatically changes from the Fisher-Langer type (ferromagneticlike) to the Suezaki-Mori (SM) type near 17kbar , i.e., from a positive divergence to a negative divergence in the temperature derivative of the resistivity. The pressure-induced SM-type anomaly, which shows thermal hysteresis, is easily suppressed by a small magnetic field ( 1.9kOe for 19.8kbar ), indicating a weakly first-order nature of the transition. By subtracting a low-pressure data set, we directly compare the resistivity anomaly with the SM theory without any assumption on backgrounds, where the negative divergence in dρ/dT is ascribed to enhanced critical fluctuations in the presence of superzone gaps.
- Publication:
-
Physical Review B
- Pub Date:
- August 2005
- DOI:
- 10.1103/PhysRevB.72.060410
- arXiv:
- arXiv:cond-mat/0506546
- Bibcode:
- 2005PhRvB..72f0410P
- Keywords:
-
- 75.20.Hr;
- 68.35.Rh;
- 71.27.+a;
- 72.15.Qm;
- Local moment in compounds and alloys;
- Kondo effect valence fluctuations heavy fermions;
- Phase transitions and critical phenomena;
- Strongly correlated electron systems;
- heavy fermions;
- Scattering mechanisms and Kondo effect;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 5 pages, 4 figures