Anomalous Lattice Effect Originated Metal-Insulator Transition in FeSe$_x$
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866917906448646144 |
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| author | Purwar, Shubham Paul, Shinjini Vijay, Kritika Venkatesh, R. Banik, Soma Mahadevan, P. Thirupathaiah, S. |
| author_facet | Purwar, Shubham Paul, Shinjini Vijay, Kritika Venkatesh, R. Banik, Soma Mahadevan, P. Thirupathaiah, S. |
| contents | We present a comprehensive investigation of the structural, electrical transport, and magnetic properties of FeSe$_{\it{x}}$ ($\it{x}$ = 1.14, 1.18, 1.23, 1.28, and 1.32) to unravel the mechanism of the metal-insulator transition observed in these systems. For this, we systematically evaluated the structural parameters of FeSe$_{\it{x}}$ as a function of Se concentration and temperature. We observe increased lattice constants and cell volume with increased Se concentration. On the other hand, the temperature-dependent XRD studies suggest unusual lattice change around the metal-insulator (MI) transition temperature of the respective compositions. This remarkable observation suggests that the anomalous lattice effect originates the MI transition in these systems. Additionally, our density of states (DOS) calculations on FeSe$_{1.14}$ qualitatively explain the MI transition, as the low-temperature (50 K) structure DOS suggests a metallic nature and the high-temperature (300 K) structure DOS shows a gap near the Fermi level. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_12724 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Anomalous Lattice Effect Originated Metal-Insulator Transition in FeSe$_x$ Purwar, Shubham Paul, Shinjini Vijay, Kritika Venkatesh, R. Banik, Soma Mahadevan, P. Thirupathaiah, S. Strongly Correlated Electrons Materials Science We present a comprehensive investigation of the structural, electrical transport, and magnetic properties of FeSe$_{\it{x}}$ ($\it{x}$ = 1.14, 1.18, 1.23, 1.28, and 1.32) to unravel the mechanism of the metal-insulator transition observed in these systems. For this, we systematically evaluated the structural parameters of FeSe$_{\it{x}}$ as a function of Se concentration and temperature. We observe increased lattice constants and cell volume with increased Se concentration. On the other hand, the temperature-dependent XRD studies suggest unusual lattice change around the metal-insulator (MI) transition temperature of the respective compositions. This remarkable observation suggests that the anomalous lattice effect originates the MI transition in these systems. Additionally, our density of states (DOS) calculations on FeSe$_{1.14}$ qualitatively explain the MI transition, as the low-temperature (50 K) structure DOS suggests a metallic nature and the high-temperature (300 K) structure DOS shows a gap near the Fermi level. |
| title | Anomalous Lattice Effect Originated Metal-Insulator Transition in FeSe$_x$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2501.12724 |