Valence Bond Glass and Glassy Spin Liquid in Disordered Frustrated Magnets
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866914451241828352 |
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| author | Dash, Soumyaranjan Narang, Vansh Kumar, Sanjeev |
| author_facet | Dash, Soumyaranjan Narang, Vansh Kumar, Sanjeev |
| contents | The absence of conventional magnetic order together with anomalous low-temperature magnetic heat capacity is often interpreted as evidence for quantum spin liquid ground states in frustrated magnets. Using a recently developed semiclassical Monte Carlo approach, we show that similar thermodynamic signatures arise in the highly frustrated regime of the disordered spin-1/2 J1-J2 Heisenberg model on the square lattice. By analyzing the freezing parameters, the distribution of spin-spin correlations, and the specific heat, we identify the ground state as a valence-bond glass that melts into a glassy spin liquid at finite temperatures. We show that the low-temperature specific-heat anomaly originates from collective singlet excitations, and consequently it is insensitive to external magnetic fields. This leads to a robust experimental signature of the valence bond glass phase and a completely new interpretation of the thermodynamic data on disordered spin-liquid candidate materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_05501 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Valence Bond Glass and Glassy Spin Liquid in Disordered Frustrated Magnets Dash, Soumyaranjan Narang, Vansh Kumar, Sanjeev Strongly Correlated Electrons The absence of conventional magnetic order together with anomalous low-temperature magnetic heat capacity is often interpreted as evidence for quantum spin liquid ground states in frustrated magnets. Using a recently developed semiclassical Monte Carlo approach, we show that similar thermodynamic signatures arise in the highly frustrated regime of the disordered spin-1/2 J1-J2 Heisenberg model on the square lattice. By analyzing the freezing parameters, the distribution of spin-spin correlations, and the specific heat, we identify the ground state as a valence-bond glass that melts into a glassy spin liquid at finite temperatures. We show that the low-temperature specific-heat anomaly originates from collective singlet excitations, and consequently it is insensitive to external magnetic fields. This leads to a robust experimental signature of the valence bond glass phase and a completely new interpretation of the thermodynamic data on disordered spin-liquid candidate materials. |
| title | Valence Bond Glass and Glassy Spin Liquid in Disordered Frustrated Magnets |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.05501 |