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강상관계 물질 연구단
강상관계 물질 연구단
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Lifshitz-transition-driven metal-insulator transition in moderately spin-orbit-coupled Sr2-xLaxRhO4

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Title
Lifshitz-transition-driven metal-insulator transition in moderately spin-orbit-coupled Sr2-xLaxRhO4
Author(s)
Junyoung Kwon; Minsoo Kim; Dongjoon Song; Yoshiyuki Yoshida; Jonathan Denlinger; Wonshik Kyung; Changyoung Kim
Publication Date
2019-09
Journal
PHYSICAL REVIEW LETTERS, v.123, no.10, pp.106401 -
Publisher
AMER PHYSICAL SOC
Abstract
© 2019 American Physical Society.Motivated by the novel insulating state of Sr2IrO4 from strong spin-orbit coupling (SOC), we investigate, by means of angle resolved photoemission, the metal-insulator transition (MIT) mechanism in Sr2-xLaxRhO4 whose mother compound is isovalent and isostructural but has smaller SOC strength compared to Sr2IrO4. Transport and angle resolved photoemission results from single crystalline Sr2-xLaxRhO4 revealed that the MIT occurs coincidentally with a multi-to single-band transition (Lifshitz transition) at x=0.4. Starting from x=0.4, there is a gradual but anomalous enhancement in the band gap size with additional electron doping, suggesting that the insulating phase in Sr2-xLaxRhO4 is a new type which has been rarely investigated. These results suggest that the insulating phase in Sr2-xLaxRhO4 is likely induced by the moderate SOC strength and electron doping effect from the La. Our findings not only elucidate the MIT mechanism in Sr2-xLaxRhO4, but may also open new avenues for novel MIT research in moderate SOC regimes
URI
https://pr.ibs.re.kr/handle/8788114/6872
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
70158_Lifshitz-transition-driven metal-insulator transition in moderately spin-orbit-coupled Sr2-xLaxRhO4.pdfDownload

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