Spin order on pyrochlore lattices studied by the Self-Consistent Cluster Approach
| dc.creator | Geertsma, Wiebe | |
| dc.date | 2002-08-06 | |
| dc.date.accessioned | 2026-07-07T02:46:44Z | |
| dc.date.available | 2026-07-07T02:46:44Z | |
| dc.description | In this paper we present a study of magnetic order of quantum Heisenberg spins on pyrochlore type lattices: a lattice of corner sharing tetrahedra. We use the Cluster Variation Approximation with the tetrahedron as basic cluster. We find that in case of anti-ferromagnetic nearest--neighbour exchange there is no long--range spin order at any finite temperature for any spin s. For ferromagnetic exchange and s=1/2 the spin system remains in a non-magnetic phase for all temperatures, while for s > 1/2 there is a finite order temperature. We derive the ground state phase diagram as a function of exchange anisotropy and tetragonal anisotropy and find regions of re--entrant behaviour. Magnetic fields can induce one or more magnetic transitions. Schottky--like anomalies appear in the specific heat, with on top signs of re--entrant behaviour. The limits of this Cluster Variation Approximations are discussed. | |
| dc.description | Latex 50 pgs; 6 tables; 18 figures (eps) | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0208119 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0208119 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/19743 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Materials Science | |
| dc.title | Spin order on pyrochlore lattices studied by the Self-Consistent Cluster Approach | |
| dc.type | text |