Orbital Ordering in the Charge Density Wave Phases of BaNi 2 (As₁₋ₓPₓ)₂
Lacmann, Tom
1; Eder, Robert 1; Vinograd, Igor 2; Merz, Michael 1,3; Frachet, Mehdi 2; McGuinness, Philippa Helen 2; Kummer, Kurt; Schierle, Enrico; Haghighirad, Amir-Abbas 1; Souliou, Sofia-Michaela 1; Le Tacon, Matthieu
1
1 Institut für QuantenMaterialien und Technologien (IQMT), Karlsruher Institut für Technologie (KIT)
2 Karlsruher Institut für Technologie (KIT)
3 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)
1; Eder, Robert 1; Vinograd, Igor 2; Merz, Michael 1,3; Frachet, Mehdi 2; McGuinness, Philippa Helen 2; Kummer, Kurt; Schierle, Enrico; Haghighirad, Amir-Abbas 1; Souliou, Sofia-Michaela 1; Le Tacon, Matthieu
11 Institut für QuantenMaterialien und Technologien (IQMT), Karlsruher Institut für Technologie (KIT)
2 Karlsruher Institut für Technologie (KIT)
3 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)
Abstract:
We use resonant x-ray scattering at the nickel L2;3 edges to investigate the interplay between orbital
degrees of freedom and charge density waves (CDWs) in the superconductor BaNi2ðAs1-xPxÞ2. 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 and
nematic fluctuations in the high-temperature regime of the superconductor BaNi2ðAs1-xPxÞ2.
degrees of freedom and charge density waves (CDWs) in the superconductor BaNi2ðAs1-xPxÞ2. 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 and
nematic fluctuations in the high-temperature regime of the superconductor BaNi2ðAs1-xPxÞ2.
| Zugehörige Institution(en) am KIT | Institut für QuantenMaterialien und Technologien (IQMT) Karlsruhe Nano Micro Facility (KNMF) |
| Publikationstyp | Zeitschriftenaufsatz |
| Publikationsdatum | 23.01.2026 |
| Sprache | Englisch |
| Identifikator | ISSN: 0031-9007, 1079-7114 KITopen-ID: 1000189917 |
| HGF-Programm | 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena |
| Erschienen in | Physical Review Letters |
| Verlag | American Physical Society (APS) |
| Band | 136 |
| Heft | 3 |
| Seiten | Article no: 036504 |
| Nachgewiesen in | OpenAlex |