Cluster-glass phase in pyrochlore XY antiferromagnets with quenched disorder.
ANDRADE, Eric de Castro e; HOYOS, José Abel; RACHEL, Stephan; VOJTA, Matthias.
ANDRADE, Eric de Castro e; HOYOS, José Abel; RACHEL, Stephan; VOJTA, Matthias.
 Abstract: We study the impact of quenched disorder (random exchange couplings or site dilution) on easy-plane pyrochlore antiferromagnets. In the clean system, order by disorder selects a magnetically ordered state from a classically degenerate manifold. In the presence of randomness, however, different orders can be chosen locally depending on details of the disorder configuration. Using a combination of analytical considerations and classical Monte Carlo simulations, we argue that any long-range-ordered magnetic state is destroyed beyond a critical level of randomness where the system breaks into magnetic domains due to random exchange anisotropies, becoming, therefore, a glass of spin clusters, in accordance with the available experimental data. These random anisotropies originate from off-diagonal exchange couplings in the microscopic Hamiltonian, establishing their relevance to other magnets with strong spin-orbit coupling. | |
| Physical Review Letters |
| v. 120, n. 9, p. 097204-1-097204-6 - Ano: 2018 |
| Fator de Impacto: 8,462 |
| http://dx.doi.org/10.1103/PhysRevLett.120.097204 |  @article={002876060,author = {ANDRADE, Eric de Castro e; HOYOS, José Abel; RACHEL, Stephan; VOJTA, Matthias.},title={Cluster-glass phase in pyrochlore XY antiferromagnets with quenched disorder},journal={Physical Review Letters},note={v. 120, n. 9, p. 097204-1-097204-6},year={2018}} |
