| Full text | |
| Author(s): |
Miranda, Michel M. J.
[1, 2, 3, 4]
;
Almeida, Igor C.
[2]
;
Andrade, Eric C.
[2]
;
Hoyos, Jose A.
[2]
Total Authors: 4
|
| Affiliation: | [1] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden - Germany
[2] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
[3] Max Planck Inst Chem Phys Fester Stoffe, Nothnitzer Str 40, D-01187 Dresden - Germany
[4] Tech Univ Dresden, Wurzburg Dresden Cluster Excellence Ct Qmat, D-01062 Dresden - Germany
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Physical Review B; v. 104, n. 5 AUG 4 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
We study the effects of bond and site disorder in the classical J(1)-J(2) Heisenberg model on a square lattice in the order-by-disorder frustrated regime 2J(2) > vertical bar J(1)vertical bar. Combining symmetry arguments, numerical energy minimization, and large-scale Monte Carlo simulations, we establish that the finite-temperature Ising-type transition of the clean system is destroyed in the presence of any finite concentration of impurities. We explain this finding via a random-field mechanism which generically emerges in systems where disorder locally breaks the same real-space symmetry spontaneously globally broken by the associated order parameter. We also determine that the phase replacing the clean one is a paramagnet polarized in the nematic glass order with nontrivial magnetic response. This is because disorder also induces noncollinear spin-vortex-crystal order and produces a conjugated transverse dipolar random field. As a result of these many competing effects, the associated magnetic susceptibilities are nonmonotonic functions of the temperature. As a further application of our methods, we show the generation of random axes in other frustrated magnets with broken SU(2) symmetry. We also discuss the generality of our findings and their relevance to experiments. (AU) | |
| FAPESP's process: | 19/17026-9 - Frustrated magnets: anisotropy and and inhomogeneities |
| Grantee: | Eric de Castro e Andrade |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 19/17645-0 - Magnetic excitations in inhomogeneous frustrated magnets |
| Grantee: | Igor César de Almeida |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 15/23849-7 - Quantum spin chains |
| Grantee: | Francisco Castilho Alcaraz |
| Support Opportunities: | Research Projects - Thematic Grants |
| 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 |