Vergara, I, Magnaterra, M., Warzanowski, P., Attig, J., Kunkemoeller, S., Khomskii, D., I, Braden, M., Hermanns, M. and Grueninger, M. (2022). Spin-orbit coupling and crystal-field splitting in Ti-doped Ca2RuO4 studied by ellipsometry. Phys. Rev. B, 106 (8). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969
Full text not available from this repository.Abstract
In Ca2RuO4, the competition of spin-orbit coupling zeta and tetragonal crystal-field splitting Delta(CF) has been discussed controversially for many years. The orbital occupation depends on Delta(CF)/zeta , which allows us to address this ratio via the optical spectral weights of the lowest intersite Mott-Hubbard excitations. We study the optical conductivity of Ca2Ru0.99Ti0.01O4 in the range of 0.75-5 eV by ellipsometry, using the large single crystals that can be grown for small Ti concentrations. Based on a local multiplet calculation, our analysis results in 2.4 <= Delta(CF)/zeta less than or similar to 4 at 15 K. The dominant crystal field yields a ground state close to xy orbital order but spin-orbit coupling is essential for a quantitative description of the properties. Furthermore, we observe a pronounced decrease of Delta(CF) with increasing temperature, as expected based on the reduction of octahedral distortions.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||
| Creators: |
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| URN: | urn:nbn:de:hbz:38-676791 | ||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1103/PhysRevB.106.085103 | ||||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Phys. Rev. B | ||||||||||||||||||||||||||||||||||||||||
| Volume: | 106 | ||||||||||||||||||||||||||||||||||||||||
| Number: | 8 | ||||||||||||||||||||||||||||||||||||||||
| Date: | 2022 | ||||||||||||||||||||||||||||||||||||||||
| Publisher: | AMER PHYSICAL SOC | ||||||||||||||||||||||||||||||||||||||||
| Place of Publication: | COLLEGE PK | ||||||||||||||||||||||||||||||||||||||||
| ISSN: | 2469-9969 | ||||||||||||||||||||||||||||||||||||||||
| Language: | English | ||||||||||||||||||||||||||||||||||||||||
| Faculty: | Unspecified | ||||||||||||||||||||||||||||||||||||||||
| Divisions: | Unspecified | ||||||||||||||||||||||||||||||||||||||||
| Subjects: | no entry | ||||||||||||||||||||||||||||||||||||||||
| Uncontrolled Keywords: |
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| URI: | http://kups.ub.uni-koeln.de/id/eprint/67679 |
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