Orbital Ordering in the Charge Density Wave Phases of BaNi$_2$(As$_{1-x}$P$_x$)$_2$
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915748791713792 |
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| author | Lacmann, Tom Eder, Robert Vinograd, Igor Merz, Michael Frachet, Mehdi McGuinness, Philippa Helen Kummer, Kurt Schierle, Enrico Haghighirad, Amir-Abbas Souliou, Sofia-Michaela Tacon, Matthieu Le |
| author_facet | Lacmann, Tom Eder, Robert Vinograd, Igor Merz, Michael Frachet, Mehdi McGuinness, Philippa Helen Kummer, Kurt Schierle, Enrico Haghighirad, Amir-Abbas Souliou, Sofia-Michaela Tacon, Matthieu Le |
| contents | We use resonant X-ray scattering at the nickel L$_{2,3}$ edges to investigate the interplay between orbital degrees of freedom and charge density waves (CDW) in the superconductor BaNi$_2$(As$_{1-x}$P$_x$)$_2$. Both the incommensurate and commensurate CDWs in this system exhibit strong resonant enhancement with distinct energy and polarization dependencies, indicative of orbital ordering. Azimuthal-angle-dependent measurements reveal a lowering of the local Ni site symmetry, consistent with monoclinic or lower point group symmetry. The scattering signatures of both CDWs are dominated by contributions from Ni $d_{xz,yz}$ orbitals, with similar orbital character despite their distinct wave vectors. These findings point to a shared orbital-driven formation mechanism and provide new insight into the symmetry breaking and orbital/nematic fluctuations in the high-temperature regime of the superconductor BaNi$_2$(As$_{1-x}$P$_x$)$_2$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_05200 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Orbital Ordering in the Charge Density Wave Phases of BaNi$_2$(As$_{1-x}$P$_x$)$_2$ Lacmann, Tom Eder, Robert Vinograd, Igor Merz, Michael Frachet, Mehdi McGuinness, Philippa Helen Kummer, Kurt Schierle, Enrico Haghighirad, Amir-Abbas Souliou, Sofia-Michaela Tacon, Matthieu Le Superconductivity Strongly Correlated Electrons We use resonant X-ray scattering at the nickel L$_{2,3}$ edges to investigate the interplay between orbital degrees of freedom and charge density waves (CDW) in the superconductor BaNi$_2$(As$_{1-x}$P$_x$)$_2$. Both the incommensurate and commensurate CDWs in this system exhibit strong resonant enhancement with distinct energy and polarization dependencies, indicative of orbital ordering. Azimuthal-angle-dependent measurements reveal a lowering of the local Ni site symmetry, consistent with monoclinic or lower point group symmetry. The scattering signatures of both CDWs are dominated by contributions from Ni $d_{xz,yz}$ orbitals, with similar orbital character despite their distinct wave vectors. These findings point to a shared orbital-driven formation mechanism and provide new insight into the symmetry breaking and orbital/nematic fluctuations in the high-temperature regime of the superconductor BaNi$_2$(As$_{1-x}$P$_x$)$_2$. |
| title | Orbital Ordering in the Charge Density Wave Phases of BaNi$_2$(As$_{1-x}$P$_x$)$_2$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.05200 |