Frustrated Heisenberg antiferromagnet on the pyrochlore lattice - art. no.144432

Authors
Koga, A Kawakami, N
Citation
A. Koga et N. Kawakami, Frustrated Heisenberg antiferromagnet on the pyrochlore lattice - art. no.144432, PHYS REV B, 6314(14), 2001, pp. 4432
Citations number
33
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6314
Issue
14
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010401)6314:14<4432:FHAOTP>2.0.ZU;2-C
Abstract
We investigate quantum phase transitions for the s=1/2 antiferromagnetic He isenberg model on the pyrochlore lattice. By means of the series expansion method starting from isolated tetrahedra, the ground-state phase diagram is determined. When the ratio of the two competing exchange couplings is vari ed, a first-order (second-order) quantum phase transition occurs between tw o spin gap phases (the spin-gap and the antiferromagnetic phases). We also discuss some properties expected for the s=1 pyrochlore spin system.