Vibronic collapse of ordered quadrupolar ice in the pyrochore magnet Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866908757530771456 |
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| author | Alexanian, Yann Robert, Julien Simonet, Virginie Langérôme, Benjamin Brubach, Jean-Blaise Roy, Pascale Decorse, Claudia Lhotel, Elsa Constable, Evan Ballou, Rafik De Brion, Sophie |
| author_facet | Alexanian, Yann Robert, Julien Simonet, Virginie Langérôme, Benjamin Brubach, Jean-Blaise Roy, Pascale Decorse, Claudia Lhotel, Elsa Constable, Evan Ballou, Rafik De Brion, Sophie |
| contents | While the spin liquid state in the frustrated pyrochlore Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$ has been studied both experimentally and theoretically for more than two decades, no definite description of this unconventional state has been achieved. Using synchrotron based THz spectroscopy in combination with quantum numerical simulations, we highlight a significant link between two previously unrelated features: the existence of a quadrupolar order following an ice rule and the presence of strong magneto-elastic coupling in the form of hybridized Tb$^{3+}$ crystal-field and phonon modes. The magnitude of this so-called vibronic process, which involves quadrupolar degrees of freedom, is significantly dependent on small off-stoichiometry $x$ and favors all-in all-out like correlations between quadrupoles. This mechanism competes with the long range ordered quadrupolar ice, and for slightly different stoichiometry, is able to destabilize it. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2207_10036 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Vibronic collapse of ordered quadrupolar ice in the pyrochore magnet Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$ Alexanian, Yann Robert, Julien Simonet, Virginie Langérôme, Benjamin Brubach, Jean-Blaise Roy, Pascale Decorse, Claudia Lhotel, Elsa Constable, Evan Ballou, Rafik De Brion, Sophie Strongly Correlated Electrons While the spin liquid state in the frustrated pyrochlore Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$ has been studied both experimentally and theoretically for more than two decades, no definite description of this unconventional state has been achieved. Using synchrotron based THz spectroscopy in combination with quantum numerical simulations, we highlight a significant link between two previously unrelated features: the existence of a quadrupolar order following an ice rule and the presence of strong magneto-elastic coupling in the form of hybridized Tb$^{3+}$ crystal-field and phonon modes. The magnitude of this so-called vibronic process, which involves quadrupolar degrees of freedom, is significantly dependent on small off-stoichiometry $x$ and favors all-in all-out like correlations between quadrupoles. This mechanism competes with the long range ordered quadrupolar ice, and for slightly different stoichiometry, is able to destabilize it. |
| title | Vibronic collapse of ordered quadrupolar ice in the pyrochore magnet Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2207.10036 |