Spectroscopic evidence of Kondo-induced quasi-quartet in CeRh$_2$As$_2$
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arXiv
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2023
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| author | Christovam, Denise S. Ferreira-Carvalho, Miguel Marino, Andrea Sundermann, Martin Takegami, Daisuke Melendez-Sans, Anna Tsuei, Ku Ding Hu, Zhiwei Roessler, Sahana Valvidares, Manuel Haverkort, Maurits W. Liu, Yu Bauer, Eric D. Tjeng, Liu Hao Zwicknagl, Gertrud Severing, Andrea |
| author_facet | Christovam, Denise S. Ferreira-Carvalho, Miguel Marino, Andrea Sundermann, Martin Takegami, Daisuke Melendez-Sans, Anna Tsuei, Ku Ding Hu, Zhiwei Roessler, Sahana Valvidares, Manuel Haverkort, Maurits W. Liu, Yu Bauer, Eric D. Tjeng, Liu Hao Zwicknagl, Gertrud Severing, Andrea |
| contents | CeRh$_2$As$_2$ is a new multiphase superconductor with strong suggestions for an additional itinerant multipolar ordered phase. The modeling of the low temperature properties of this heavy fermion compound requires a quartet Ce$^{3+}$ crystal-field ground state. Here we provide the evidence for the formation of such a quartet state using x-ray spectroscopy. Core-level photoelectron and x-ray absorption spectroscopy confirm the presence of Kondo hybridization in CeRh$_2$As$_2$. The temperature dependence of the linear dichroism unambiguously reveils the impact of Kondo physics for coupling the Kramer's doublets into an effective quasi-quartet. Non-resonant inelastic x-ray scattering data find that the $|Γ_7^- \rangle$ state with its lobes along the 110 direction of the tetragonal structure ($xy$ orientation) contributes most to the multi-orbital ground state of CeRh$_2$As$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_10663 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Spectroscopic evidence of Kondo-induced quasi-quartet in CeRh$_2$As$_2$ Christovam, Denise S. Ferreira-Carvalho, Miguel Marino, Andrea Sundermann, Martin Takegami, Daisuke Melendez-Sans, Anna Tsuei, Ku Ding Hu, Zhiwei Roessler, Sahana Valvidares, Manuel Haverkort, Maurits W. Liu, Yu Bauer, Eric D. Tjeng, Liu Hao Zwicknagl, Gertrud Severing, Andrea Strongly Correlated Electrons Superconductivity CeRh$_2$As$_2$ is a new multiphase superconductor with strong suggestions for an additional itinerant multipolar ordered phase. The modeling of the low temperature properties of this heavy fermion compound requires a quartet Ce$^{3+}$ crystal-field ground state. Here we provide the evidence for the formation of such a quartet state using x-ray spectroscopy. Core-level photoelectron and x-ray absorption spectroscopy confirm the presence of Kondo hybridization in CeRh$_2$As$_2$. The temperature dependence of the linear dichroism unambiguously reveils the impact of Kondo physics for coupling the Kramer's doublets into an effective quasi-quartet. Non-resonant inelastic x-ray scattering data find that the $|Γ_7^- \rangle$ state with its lobes along the 110 direction of the tetragonal structure ($xy$ orientation) contributes most to the multi-orbital ground state of CeRh$_2$As$_2$. |
| title | Spectroscopic evidence of Kondo-induced quasi-quartet in CeRh$_2$As$_2$ |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2308.10663 |