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Anomalous low-temperature state of a possible Kondo semimetal CeOs4Sb12: Magnetic field and La impurity study

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: C R Rotundu and B Andraka

Editorial: Physical Review B, 73, p.144429, 2006.


Specific heat in magnetic fields to 14 T, magnetic susceptibility and electrical resistivity for single crystalline samples of Ce1–xLaxOs4Sb12 (x=0,0.02,0.1) are reported. The results of the magnetic susceptibility and electrical resistivity are consistent with a formation of the hybridization gap below 100 K in all investigated alloys. We argue for the intrinsic origin of a large electronic specific heat coefficient and 1.1 K anomaly. The low temperature state is very sensitive to the La alloying. On the other hand, the Kondo temperature and energy gap, extracted from susceptibility and resistance measurements, are unaffected by the alloying. The magnetic phase diagram of the pure compound is presented.

Cuvinte cheie: CeOs4Sb12