First-order phase transition driven by competing charge-order fluctuations in 1T'-TaTe$_{2}$
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arXiv
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2025
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| author | Mahatha, S. K. Kar, A. Corral-Sertal, J. Diego, Josu Korshunov, A. Lim, C. -Y. Diekmann, F. K. Subires, D. Phillips, J. Kim, T. Ishikawa, D. Marini, G. Vobornik, I. Errea, Ion Rohlf, S. Kalläne, M. Bellini, V. Baron, A. Q. R. Fumega, Adolfo O. Bosak, A. Pardo, V. Rossnagel, K. Blanco-Canosa, S. |
| author_facet | Mahatha, S. K. Kar, A. Corral-Sertal, J. Diego, Josu Korshunov, A. Lim, C. -Y. Diekmann, F. K. Subires, D. Phillips, J. Kim, T. Ishikawa, D. Marini, G. Vobornik, I. Errea, Ion Rohlf, S. Kalläne, M. Bellini, V. Baron, A. Q. R. Fumega, Adolfo O. Bosak, A. Pardo, V. Rossnagel, K. Blanco-Canosa, S. |
| contents | First-order phase transitions, characterized by a discontinuous change in the order parameter, are intriguing phenomena in condensed matter physics. However, the underlying, material-specific, microscopic mechanisms often remain unclear. Here, we unveil a high-temperature incommensurate charge-order precursor with the wave vector $\mathbf{q}^* = (0, \frac{1}{4}+δ, \frac{1}{2})$ in the 1T' phase of TaTe$_2$, which competes with fluctuating high-temperature Ta trimer bonding states at $\mathbf{q}_\mathrm{CO} =(0, \frac{1}{3}, 0)$. The precursor state follows the temperature dependence of the hidden incommensurability of the $\textit{quasi}$-1D nested Fermi surface. In contrast, the low-temperature commensurate charge order at $\mathbf{q}_\mathrm{CO}$, characterized by a charge disproportionation of the inequivalent Ta sites, appears to be driven by local chemical bonding. Dynamical lattice calculations identify an imaginary optical mode at $\mathbf{q}^*$, involving an in-plane vibration of the Ta atoms forming a chain-like structure that renormalizes below $T_\mathrm{CO}$. Our experimental and theoretical observations suggest that the controversial first-order phase transition, as captured by phenomenological Ginzburg-Landau theory, results from the competition between two order parameters: one involving Fermi surface nesting and the other involving local chemical bonding. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_13603 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | First-order phase transition driven by competing charge-order fluctuations in 1T'-TaTe$_{2}$ Mahatha, S. K. Kar, A. Corral-Sertal, J. Diego, Josu Korshunov, A. Lim, C. -Y. Diekmann, F. K. Subires, D. Phillips, J. Kim, T. Ishikawa, D. Marini, G. Vobornik, I. Errea, Ion Rohlf, S. Kalläne, M. Bellini, V. Baron, A. Q. R. Fumega, Adolfo O. Bosak, A. Pardo, V. Rossnagel, K. Blanco-Canosa, S. Strongly Correlated Electrons Materials Science First-order phase transitions, characterized by a discontinuous change in the order parameter, are intriguing phenomena in condensed matter physics. However, the underlying, material-specific, microscopic mechanisms often remain unclear. Here, we unveil a high-temperature incommensurate charge-order precursor with the wave vector $\mathbf{q}^* = (0, \frac{1}{4}+δ, \frac{1}{2})$ in the 1T' phase of TaTe$_2$, which competes with fluctuating high-temperature Ta trimer bonding states at $\mathbf{q}_\mathrm{CO} =(0, \frac{1}{3}, 0)$. The precursor state follows the temperature dependence of the hidden incommensurability of the $\textit{quasi}$-1D nested Fermi surface. In contrast, the low-temperature commensurate charge order at $\mathbf{q}_\mathrm{CO}$, characterized by a charge disproportionation of the inequivalent Ta sites, appears to be driven by local chemical bonding. Dynamical lattice calculations identify an imaginary optical mode at $\mathbf{q}^*$, involving an in-plane vibration of the Ta atoms forming a chain-like structure that renormalizes below $T_\mathrm{CO}$. Our experimental and theoretical observations suggest that the controversial first-order phase transition, as captured by phenomenological Ginzburg-Landau theory, results from the competition between two order parameters: one involving Fermi surface nesting and the other involving local chemical bonding. |
| title | First-order phase transition driven by competing charge-order fluctuations in 1T'-TaTe$_{2}$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2510.13603 |