Field-driven transition from quantum spin liquid to magnetic order in triangular-lattice antiferromagnets
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866909243838300160 |
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| author | Dey, Santanu Maciejko, Joseph Vojta, Matthias |
| author_facet | Dey, Santanu Maciejko, Joseph Vojta, Matthias |
| contents | Recently several triangular-lattice magnets with delafossite structure have been found to display spin-liquid behavior down to the lowest temperatures. Remarkably, applying a magnetic field destroys the spin liquid which then gives way to symmetry-breaking states, identified as semiclassical coplanar states including a magnetization plateau at 1/3 total magnetization. Here we provide a theoretical approach rationalizing this dichotomy, utilizing a Schwinger-boson theory that captures both ordered and disordered magnetic phases. We show that a zero-field spin liquid, driven by strong frustration, is naturally destabilized in a magnetic field via spinon condensation. Symmetry-breaking order akin to the standard triangular-lattice Heisenberg model then arises via an order-by-disorder mechanism. We discuss implications for pertinent experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_03879 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Field-driven transition from quantum spin liquid to magnetic order in triangular-lattice antiferromagnets Dey, Santanu Maciejko, Joseph Vojta, Matthias Strongly Correlated Electrons Recently several triangular-lattice magnets with delafossite structure have been found to display spin-liquid behavior down to the lowest temperatures. Remarkably, applying a magnetic field destroys the spin liquid which then gives way to symmetry-breaking states, identified as semiclassical coplanar states including a magnetization plateau at 1/3 total magnetization. Here we provide a theoretical approach rationalizing this dichotomy, utilizing a Schwinger-boson theory that captures both ordered and disordered magnetic phases. We show that a zero-field spin liquid, driven by strong frustration, is naturally destabilized in a magnetic field via spinon condensation. Symmetry-breaking order akin to the standard triangular-lattice Heisenberg model then arises via an order-by-disorder mechanism. We discuss implications for pertinent experiments. |
| title | Field-driven transition from quantum spin liquid to magnetic order in triangular-lattice antiferromagnets |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2312.03879 |