Umklapp-driven first-order transition into a charge-density wave phase
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910972996747264 |
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| author | Rozhkov, A. V. |
| author_facet | Rozhkov, A. V. |
| contents | Using phenomenological Landau free energy, we systematically analyze influence of so-called umklapp contributions on the phase diagram of a solid hosting a commensurate charge-density wave phase. The umklapp terms may change the transition into the ordered state from continuous (second-order) to discontinuous (first-order). Additional elements, such as critical and tricritical points, emerge on the phase diagram under suitable conditions. The proposed mechanism is generalized for the case of nearly-commensurate charge-density wave, as well as spin-density wave orders. Several charge-density-wave-hosting alloys are used as experimentally available examples illustrating the formalism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_02236 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Umklapp-driven first-order transition into a charge-density wave phase Rozhkov, A. V. Mesoscale and Nanoscale Physics Using phenomenological Landau free energy, we systematically analyze influence of so-called umklapp contributions on the phase diagram of a solid hosting a commensurate charge-density wave phase. The umklapp terms may change the transition into the ordered state from continuous (second-order) to discontinuous (first-order). Additional elements, such as critical and tricritical points, emerge on the phase diagram under suitable conditions. The proposed mechanism is generalized for the case of nearly-commensurate charge-density wave, as well as spin-density wave orders. Several charge-density-wave-hosting alloys are used as experimentally available examples illustrating the formalism. |
| title | Umklapp-driven first-order transition into a charge-density wave phase |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2409.02236 |