Transverse field effects on the competition between antiferromagnetic and cluster spin-glass phases
| Autor: | N. Kellermann, M. Schmidt, F. M. Zimmer |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review E. 102 |
| ISSN: | 2470-0053 2470-0045 |
| Popis: | We investigate a disordered cluster Ising antiferromagnet in the presence of a transverse field. By adopting a replica cluster mean-field framework, we analyze the role of quantum fluctuations in a model with competing short-range antiferromagnetic and intercluster disordered interactions. The model exhibits paramagnetic (PM), antiferromagnetic (AF), and cluster spin-glass (CSG) phases, which are separated by thermal and quantum phase transitions. A scenario of strong competition between AF and CSG unveils a number of interesting phenomena induced by quantum fluctuations, including a quantum PM state and quantum driven criticality. The latter occurs when the thermally driven PM-AF discontinuous phase transition becomes continuous at strong transverse fields. Analogous phenomena have been reported in a number of systems, but a description of underlying mechanisms is still required. Our results indicate that quantum driven criticality can be found in a highly competitive regime of disordered antiferromagnets, which is in consonance with recent findings in spin models with competing interactions. |
| Databáze: | OpenAIRE |
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