Comparison of Semimetallic Ce-Skutterudites and the Kondo Insulator YbB12–Field-Induced Insulator-to-Metal and Metal-to-Insulator Transitions

Autor:	Yoshiki Imai, Tetsuro Saso, Toshiyuki Izumi
Rok vydání:	2008
Předmět:	Magnetization Lattice constant Materials science Condensed matter physics Band gap Kondo insulator General Physics and Astronomy Condensed Matter::Strongly Correlated Electrons Insulator (electricity) Kondo effect Semimetal Magnetic field
Zdroj:	Journal of the Physical Society of Japan. 77:312-314
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsjs.77sa.312
Popis:	YbB 12 is a typical Kondo insulator with an energy gap E g ∼100 K. It has a cubic symmetry, but the gap closing field shows anisotropy when magnetic field is applied. CeOs 4 Sb 12 shows weak insulating behavior below 50 T. It, however, should be a semimetal according to the rule that most Ce-skutterudite compounds with lattice constant larger than 8.5 Angstrom are semimetal, and a reason for the weak insulating behavior is still unknown. We construct aproapriate tight-binding band models for these compounds and investigate the magnetic field effects on them.
Databáze:	OpenAIRE
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