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강상관계 물질 연구단
강상관계 물질 연구단
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Observation of a d-wave gap in electron-doped Sr2IrO4 Highly Cited Paper

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Title
Observation of a d-wave gap in electron-doped Sr2IrO4
Author(s)
Yeongkwan Kim; N. H. Sung; J. D. Denlinger; Bumjoon Kim
Publication Date
2016-01
Journal
NATURE PHYSICS, v.12, no.1, pp.37 - 41
Publisher
NATURE PUBLISHING GROUP
Abstract
High-temperature superconductivity in cuprates emerges out of a highly enigmatic ‘pseudogap’ metal phase. The mechanism of high-temperature superconductivity is probably encrypted in the elusive relationship between the two phases, which spectroscopically is manifested as Fermi arcs—disconnected segments of zero-energy states—collapsing into d-wave point nodes upon entering the superconducting phase. Here, we reproduce this distinct cuprate phenomenology in the 5d transition-metal oxide Sr2IrO4. Using angle-resolved photoemission, we show that the clean, low-temperature phase of 6–8% electron-doped Sr2IrO4 has gapless excitations only at four isolated points in the Brillouin zone, with a predominant d-wave symmetry of the gap. Our work thus establishes a connection between the low-temperature d-wave instability and the previously reported high-temperature Fermi arcs in electron-doped Sr2IrO4 (ref. 1). Although the physical origin of the d-wave gap remains to be understood, Sr2IrO4 is the first non-cuprate material to spectroscopically reproduce the complete phenomenology of the cuprates, thus offering a new material platform to investigate the relationship between the pseudogap and the d-wave gap. © 2015 Macmillan Publishers Limited. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/2208
ISSN
1745-2473
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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