Observation of Kondo hybridization with an orbital-selective Mott phase in 4d Ca2-xSrxRuO4
| Autor: | J. E. Jung, Moonsup Han, Jonathan D. Denlinger, Dongjoon Song, Daun Chung, Beom Seo Kim, Younsik Kim, Junyoung Kwon, Yoshiyuki Yoshida, Minsoo Kim, Takashi Mizokawa, Changyoung Kim, Wonshik Kyung, Hanyoung Ryu, Choong H. Kim |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Lanthanide
Physics Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Doping Fermi level FOS: Physical sciences Electron symbols.namesake Condensed Matter - Strongly Correlated Electrons Transition metal Atomic orbital Pairing Phase (matter) symbols Condensed Matter::Strongly Correlated Electrons |
| Popis: | The heavy fermion state with Kondo-hybridization (KH), usually manifested in f-electron systems with lanthanide or actinide elements, was recently discovered in several 3d transition metal compounds without f-electrons. However, KH has not yet been observed in 4d/5d transition metal compounds, since more extended 4d/5d orbitals do not usually form flat bands that supply localized electrons appropriate for Kondo pairing. Here, we report a doping- and temperature-dependent angle-resolved photoemission study on 4d Ca2-xSrxRuO4, which shows the signature of KH. We observed a spectral weight transfer in the γ-band, reminiscent of an orbital-selective Mott phase (OSMP). The Mott localized γ-band induces the KH with an itinerant β-band, resulting in spectral weight suppression around the Fermi level. Our work is the first to demonstrate the evolution of the OSMP with possible KH among 4d electrons, and thereby expands the material boundary of Kondo physics to 4d multi-orbital systems. |
| Databáze: | OpenAIRE |
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