| Full text | |
| Author(s): |
Total Authors: 4
|
| Affiliation: | [1] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
[2] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden - Germany
[3] Univ Melbourne, Sch Phys, Parkville, Vic 3010 - Australia
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Physical Review Letters; v. 120, n. 9 MAR 2 2018. |
| Web of Science Citations: | 12 |
| 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. (AU) | |
| FAPESP's process: | 16/10826-1 - Multi-user equipment approved in grant 2015/23849-7: computer cluster |
| Grantee: | Francisco Castilho Alcaraz |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 15/23849-7 - Quantum spin chains |
| Grantee: | Francisco Castilho Alcaraz |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/00681-8 - Disordered magnets: ground state, excitations, and thermodynamics |
| Grantee: | Eric de Castro e Andrade |
| Support Opportunities: | Research Grants - Young Investigators Grants |