Pressure-tuned First-order Phase Transition and Accompanying Resistivity Anomaly in CeZn_{1-δ}Sb_{2}

Details Pressure-tuned First-order Phase Transition and Accompanying Resistivity Anomaly in CeZn_{1-δ}Sb_{2} Pressure-tuned First-order Phase Transition and Accompanying Resistivity Anomaly in CeZn_{1-δ}Sb_{2}

2005-06-21

arxiv.org/abs/cond-mat/0506546v2

Phys. Rev. B 72, R060410 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures; journal-ref added

Scientific paper

10.1103/PhysRevB.72.060410

The Kondo lattice system CeZn_{0.66}Sb_{2} is studied by the electrical resistivity and ac magnetic susceptibility measurements at several pressures. At P=0 kbar, ferromagnetic and antiferromagnetic transitions appear at 3.6 and 0.8 K, respectively. The electrical resistivity at T_N dramatically changes from the Fisher-Langer type (ferromagnetic like) to the Suzaki-Mori type near 17 kbar, 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 small magnetic field (1.9 kOe for 19.8 kbar), 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 d\rho/dT is ascribed to enhanced critical fluctuations in the presence of superzone gaps.

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