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Rev. Lett."],"accepted":{"date-parts":[[2023,12,1]]},"abstract":"<jats:p><a:math xmlns:a=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><a:mrow><a:msub><a:mrow><a:mi>CeRh<\/a:mi><\/a:mrow><a:mrow><a:mn>2<\/a:mn><\/a:mrow><\/a:msub><a:mrow><a:msub><a:mrow><a:mi>As<\/a:mi><\/a:mrow><a:mrow><a:mn>2<\/a:mn><\/a:mrow><\/a:msub><\/a:mrow><\/a:mrow><\/a:math> 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 <c:math xmlns:c=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><c:mrow><c:msup><c:mrow><c:mi>Ce<\/c:mi><\/c:mrow><c:mrow><c:mn>3<\/c:mn><c:mo>+<\/c:mo><\/c:mrow><\/c:msup><\/c:mrow><\/c:math> 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 <e:math xmlns:e=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><e:mrow><e:mrow><e:msub><e:mrow><e:mi>CeRh<\/e:mi><\/e:mrow><e:mrow><e:mn>2<\/e:mn><\/e:mrow><\/e:msub><\/e:mrow><e:mrow><e:msub><e:mrow><e:mi>As<\/e:mi><\/e:mrow><e:mrow><e:mn>2<\/e:mn><\/e:mrow><\/e:msub><\/e:mrow><\/e:mrow><\/e:math>. The temperature dependence of the linear dichroism unambiguously reveals the impact of Kondo physics for coupling the Kramer\u2019s doublets into an effective quasiquartet. Nonresonant inelastic x-ray scattering data find that the <g:math xmlns:g=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><g:mrow><g:mo stretchy=\"false\">|<\/g:mo><g:msubsup><g:mrow><g:mi mathvariant=\"normal\">\u0393<\/g:mi><\/g:mrow><g:mrow><g:mn>7<\/g:mn><\/g:mrow><g:mrow><g:mo>\u2212<\/g:mo><\/g:mrow><\/g:msubsup><g:mo stretchy=\"false\">\u27e9<\/g:mo><\/g:mrow><\/g:math> state with its lobes along the 110 direction of the tetragonal structure (<l:math xmlns:l=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><l:mi>x<\/l:mi><l:mi>y<\/l:mi><\/l:math> orientation) contributes most to the multiorbital ground state of <n:math xmlns:n=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><n:mrow><n:mrow><n:msub><n:mrow><n:mi>CeRh<\/n:mi><\/n:mrow><n:mrow><n:mn>2<\/n:mn><\/n:mrow><\/n:msub><\/n:mrow><n:mrow><n:msub><n:mrow><n:mi>As<\/n:mi><\/n:mrow><n:mrow><n:mn>2<\/n:mn><\/n:mrow><\/n:msub><\/n:mrow><\/n:mrow><\/n:math>.<\/jats:p>\n          <jats:sec>\n            <jats:title\/>\n            <jats:supplementary-material>\n              <jats:permissions>\n                <jats:copyright-statement>Published by the American Physical Society<\/jats:copyright-statement>\n                <jats:copyright-year>2024<\/jats:copyright-year>\n              <\/jats:permissions>\n            <\/jats:supplementary-material>\n          <\/jats:sec>","DOI":"10.1103\/physrevlett.132.046401","type":"journal-article","created":{"date-parts":[[2024,1,22]],"date-time":"2024-01-22T15:59:54Z","timestamp":1705939194000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":23,"title":["Spectroscopic Evidence of Kondo-Induced Quasiquartet in \n<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>CeRh<\/mml:mi><\/mml:mrow><mml:mrow><mml:mn>2<\/mml:mn><\/mml:mrow><\/mml:msub><\/mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>As<\/mml:mi><\/mml:mrow><mml:mrow><mml:mn>2<\/mml:mn><\/mml:mrow><\/mml:msub><\/mml:mrow><\/mml:mrow><\/mml:math>"],"prefix":"10.1103","volume":"132","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5069-8107","authenticated-orcid":true,"given":"Denise S.","family":"Christovam","sequence":"first","affiliation":[{"name":"Max Planck Institute for Chemical Physics of Solids, N\u00f6thnitzer Stra\u00dfe 40, 01187 Dresden, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2899-5340","authenticated-orcid":true,"given":"Miguel","family":"Ferreira-Carvalho","sequence":"additional","affiliation":[{"name":"Max Planck Institute for Chemical Physics of Solids, N\u00f6thnitzer Stra\u00dfe 40, 01187 Dresden, Germany"},{"name":"Institute of Physics II, 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