Thermodynamical Study on the Heavy-Fermion Superconductor PrOs4Sb12: Evidence for Field-Induced Phase Transition
By Y. Aoki, T. Namiki, S. Ohsaki, Shanta R. Saha, H. Sugawara, H. Sato. 2002
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We report measurements of low-temperature specific heat on the 4 f 2 -based heavy-fermion superconductor PrOs 4 Sb 12 . In magnetic fields above 4.5 T in the normal state, distinct anomalies are found which demonstrate the existence of a field-induced ordered phase (FIOP). The Pr nuclear specific heat indicates an enhancement of the 4 f magnetic moment in the FIOP. Utilizing a Maxwell relation, we conclude that anomalous entropy, which is expected for a single-site quadrupole Kondo model, is not concealed below 0.16 K in zero field. We also discuss two possible interpretations of the Schottky-like anomaly at ∼3 K, i.e., a crystalline-field excitation or a hybridization gap formation.
Subfields: Condensed Matter Physics, General Materials Science, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/8cec840603606e1c246c7c782fc0e65d9faa3029
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In Condensed Matter Physics
Citations in the corpus
- Superconducting phases of f -electron compounds (2009, background): “Inelastic neutron scattering (Goremychkin et al., 2004) and detailed measurements of the magnetic field dependence (Aoki et al., 2002) have settled this issue and it is now accepted (Bauer et al., 2006b), that the ground state is a Γ1 singlet, followed by a Γ4 triplet first excited state.”