Dipolar-octupolar correlations and hierarchy of exchange interactions in Ce$_2$Hf$_2$O$_7$
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arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866914164563247104 |
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| author | Porée, Victor Bhardwaj, Anish Lhotel, Elsa Petit, Sylvain Gauthier, Nicolas Yan, Han Pomjakushin, Vladimir Ollivier, Jacques Quilliam, Jeffrey A. Nevidomskyy, Andriy H. Changlani, Hitesh J. Sibille, Romain |
| author_facet | Porée, Victor Bhardwaj, Anish Lhotel, Elsa Petit, Sylvain Gauthier, Nicolas Yan, Han Pomjakushin, Vladimir Ollivier, Jacques Quilliam, Jeffrey A. Nevidomskyy, Andriy H. Changlani, Hitesh J. Sibille, Romain |
| contents | High-resolution neutron spectroscopy on Ce$_2$Hf$_2$O$_7$ reveals a correlated state characterized by distinct dipolar scattering signals -- quasi-elastic and inelastic contributions consistent with `photon' and `spinon' excitations in quantum spin ice. These signals coexist with weak octupolar scattering. Fits of thermodynamic data using numerical methods indicate a dominant octupolar exchange, $J_{x}$ or $J_{y}$, with substantial dipolar $J_{z}$ and minute dipole-octupole $J_{xz}$ couplings. The $J_{xz}$ value is corroborated by an independent fit of the neutron scattering amplitude balance between dipolar and octupolar `photon' contributions, highlighting its importance to understand neutron scattering results in this family. Ce$_2$Hf$_2$O$_7$ enriches the landscape of dipole-octupole pyrochlore physics, and reveals a `quantum multipolar liquid' where hybrid correlations involve multiple terms in moment series expansion, opening questions on their intertwining and hierarchy in quantum phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_08261 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Dipolar-octupolar correlations and hierarchy of exchange interactions in Ce$_2$Hf$_2$O$_7$ Porée, Victor Bhardwaj, Anish Lhotel, Elsa Petit, Sylvain Gauthier, Nicolas Yan, Han Pomjakushin, Vladimir Ollivier, Jacques Quilliam, Jeffrey A. Nevidomskyy, Andriy H. Changlani, Hitesh J. Sibille, Romain Strongly Correlated Electrons Materials Science High-resolution neutron spectroscopy on Ce$_2$Hf$_2$O$_7$ reveals a correlated state characterized by distinct dipolar scattering signals -- quasi-elastic and inelastic contributions consistent with `photon' and `spinon' excitations in quantum spin ice. These signals coexist with weak octupolar scattering. Fits of thermodynamic data using numerical methods indicate a dominant octupolar exchange, $J_{x}$ or $J_{y}$, with substantial dipolar $J_{z}$ and minute dipole-octupole $J_{xz}$ couplings. The $J_{xz}$ value is corroborated by an independent fit of the neutron scattering amplitude balance between dipolar and octupolar `photon' contributions, highlighting its importance to understand neutron scattering results in this family. Ce$_2$Hf$_2$O$_7$ enriches the landscape of dipole-octupole pyrochlore physics, and reveals a `quantum multipolar liquid' where hybrid correlations involve multiple terms in moment series expansion, opening questions on their intertwining and hierarchy in quantum phases. |
| title | Dipolar-octupolar correlations and hierarchy of exchange interactions in Ce$_2$Hf$_2$O$_7$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2305.08261 |