Raman scattering fingerprints of the charge density wave state in one-dimensional NbTe$_4$
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866910151487782912 |
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| author | Zawadzka, Natalia Sevik, Cem Muhammad, Zahir Rehman, Zia Ur Zhao, Weisheng Babiński, Adam Molas, Maciej R. |
| author_facet | Zawadzka, Natalia Sevik, Cem Muhammad, Zahir Rehman, Zia Ur Zhao, Weisheng Babiński, Adam Molas, Maciej R. |
| contents | Charge-density waves (CDWs) are ordered quantum states of conduction electrons accompanied by periodic lattice distortions. Raman scattering (RS) spectroscopy is therefore well suited for probing CDW-induced structural modulations. We investigate the CDW state in quasi-one-dimensional NbTe$_4$ using RS spectroscopy. At $T$=5~K, the resonantly enhanced Raman spectrum exhibits 25 phonon modes. Polarization-dependent measurements reveal a strong coupling between phonon-mode symmetry and crystallographic symmetry, with modes polarized parallel or perpendicular to the crystallographic $c$-axis, along which the one-dimensional structure is elongated. Temperature-dependent RS measurements identify a transition between commensurate and incommensurate CDW phases, accompanied by pronounced thermal hysteresis, with transition temperatures of approximately 45~K upon cooling and 90~K upon warming. The hysteresis width depends on the warming rate, indicating a finite nucleation rate of CDW domains and suggesting potential relevance for memory-device applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_11502 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Raman scattering fingerprints of the charge density wave state in one-dimensional NbTe$_4$ Zawadzka, Natalia Sevik, Cem Muhammad, Zahir Rehman, Zia Ur Zhao, Weisheng Babiński, Adam Molas, Maciej R. Materials Science Mesoscale and Nanoscale Physics Charge-density waves (CDWs) are ordered quantum states of conduction electrons accompanied by periodic lattice distortions. Raman scattering (RS) spectroscopy is therefore well suited for probing CDW-induced structural modulations. We investigate the CDW state in quasi-one-dimensional NbTe$_4$ using RS spectroscopy. At $T$=5~K, the resonantly enhanced Raman spectrum exhibits 25 phonon modes. Polarization-dependent measurements reveal a strong coupling between phonon-mode symmetry and crystallographic symmetry, with modes polarized parallel or perpendicular to the crystallographic $c$-axis, along which the one-dimensional structure is elongated. Temperature-dependent RS measurements identify a transition between commensurate and incommensurate CDW phases, accompanied by pronounced thermal hysteresis, with transition temperatures of approximately 45~K upon cooling and 90~K upon warming. The hysteresis width depends on the warming rate, indicating a finite nucleation rate of CDW domains and suggesting potential relevance for memory-device applications. |
| title | Raman scattering fingerprints of the charge density wave state in one-dimensional NbTe$_4$ |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2601.11502 |