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원자제어 저차원 전자계 연구단
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Spin-wave gap collapse in Rh-doped Sr2IrO4

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Title
Spin-wave gap collapse in Rh-doped Sr2IrO4
Author(s)
Bertinshaw, Joel; Jin Kwang Kim; Porras, Juan; Ueda, K; Sung, Na-Hye; Efimenko, A. K.; Bombardi, Alessandro; Kim, Jungho; Keimer, Bernhard; Bum Joon Kim
Subject
PHYSICS
Publication Date
2020-03
Journal
PHYSICAL REVIEW B, v.101, no.9, pp.094428
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 authors. Published by the American Physical Society. We use resonant inelastic x-ray scattering (RIXS) at the Ir L-3 edge to study the effect of hole doping upon the J(eff) = 1/2 aMott-insulating state in Sr2IrO4, via Rh replacement of the Jr site. The spin-wave gap, associated with XY-type spin-exchange anisotropy, collapses with increasing Rh content, prior to the suppression of the Mott-insulating state and in contrast to electron doping via La substitution of the Sr site. At the same time, despite heavy damping, the d-d excitation spectra retain their overall amplitude and dispersion character. A careful study of the spin-wave spectrum reveals that deviations from the J(1)-J(2)-J(3) Heisenberg used to model the pristine system disappear at intermediate doping levels. These findings are interpreted in terms of a modulation of Jr-Ir correlations due to the influence of Rh impurities upon nearby Jr wave functions, even as the single-band J(eff) = 1/2 amodel remains valid up to full carrier delocalization. They underline the importance of the transition metal site symmetry when doping pseudospin systems such as Sr2IrO4
URI
https://pr.ibs.re.kr/handle/8788114/8721
DOI
10.1103/PhysRevB.101.094428
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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