Anomalous magnetic phase diagram in low-carrier two-band systems and possible application to CeOs4Sb12

Abstract

Magnetic properties under the external field are investigated in low-carrier two-band systems, which may explain the nontrivial phase boundary found in temperature vs. magnetic field diagram discovered in some materials, such as filled-skutterudite compound CeOs${}_4$Sb${}_{12}$. Analysis is made both for the periodic Anderson model with the small-dispersive $f$ band and the simplified two parabolic band model in the vicinity of the Fermi level. The magnetic susceptibilities are calculated by using the random phase approximation. It is shown that the maximum value of the magnetic susceptibility perpendicular to the external field is enhanced and yields the anomalous phase boundary. By applying the magnetic field, the phase boundary shifts to higher temperature region in the insulating state with a small band gap. On the other hand, the similar phase boundary also appears in the semi-metallic states, in which the structure of the density of states in the vicinity of the Fermi level and the finite temperature effect are essential.

arXiv comment21 pages, 11 figures, To appear in Phys. Rev. B

References in corpus (6)

• Transport properties in CeOs${}_4$Sb${}_{12}$: Possibility of the ground state being semiconducting
• Field-induced Antiferromagnetism and the Kondo Insulator-to-Metal Transition
• Field-induced phase transitions in a Kondo insulator
• Field induced magnetic ordering transition in Kondo insulators
• Magnetic-Field-Induced Antiferromagnetism in Two-Dimensional Hubbard Model: Analysis of CeRhIn${}_5$
• Anomalous Metal-Insulator Transition in Filled Skutterudite CeOs${}_4$Sb${}_{12}$

Cited by in corpus (1)

• Distinct Kondo Screening Behaviors in Heavy Fermion Filled Skutterudites with 4f1 and 4f2 Configurations