Quantum effects in a half-polarized pyrochlore antiferromagnet
| dc.creator | Bergman, Doron L. | |
| dc.creator | Shindou, Ryuichi | |
| dc.creator | Fiete, Gregory A. | |
| dc.creator | Balents, Leon | |
| dc.date | 2005-10-07 | |
| dc.date.accessioned | 2026-07-07T06:44:12Z | |
| dc.date.available | 2026-07-07T06:44:12Z | |
| dc.description | We study quantum effects in a spin-3/2 antiferromagnet on the pyrochlore lattice in an external magnetic field, focusing on the vicinity of a plateau in the magnetization at half the saturation value, observed in CdCr$_2$O$_4$, and HgCr$_2$O$_4$. Our theory, based on quantum fluctuations, predicts the existence of a symmetry-broken state on the plateau, even with only nearest-neighbor microscopic exchange. This symmetry broken state consists of a particular arrangement of spins polarized parallel and antiparallel to the field in a 3:1 ratio on each tetrahedron. It quadruples the lattice unit cell, and reduces the space group from $Fd\bar{3}m$ to $P4_332$. We also predict that for fields just above the plateau, the low temperature phase has transverse spin order, describable as a Bose-Einstein condensate of magnons. Other comparisons to and suggestions for experiments are discussed. | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0510202 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0510202 | |
| dc.identifier | Phys. Rev. Lett. 96, 097207 (2006) | |
| dc.identifier | doi:10.1103/PhysRevLett.96.097207 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/102698 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Quantum effects in a half-polarized pyrochlore antiferromagnet | |
| dc.type | text |