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Title: Magnetic excitations in hole-doped Sr 2IrO 4: Comparison with electron-doped cuprates

Abstract

We have studied the evolution of magnetic and orbital excitations as a function of hole doping in single-crystal samples of Sr 2Ir 1-xRh xO 4(0.07≤ x≤0.42) using high-resolution Ir L 3-edge resonant inelastic x-ray scattering. Within the antiferromagnetically ordered region of the phase diagram ( x≤0.17) we observe highly dispersive magnon and spin-orbit exciton modes. Interestingly, both the magnon gap energy and the magnon bandwidth appear to increase as a function of doping, resulting in a hardening of the magnon mode with increasing hole doping. As a result, the observed spin dynamics of hole-doped iridates more closely resemble those of the electron-doped, rather than hole-doped, cuprates. Within the paramagnetic region of the phase diagram (0.17≤ x≤0.42) the low-lying magnon mode disappears, and we find no evidence of spin fluctuations in this regime. In addition, we observe that the orbital excitations become essentially dispersionless in the paramagnetic phase, indicating that magnetic order plays a crucial role in the propagation of the spin-orbit exciton

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1561218
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 100; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
Resonant inelastic x-ray scattering

Citation Formats

Clancy, J P, Gretarsson, H., Upton, M. H., Kim, Jungho, Cao, G., and Kim, Young-June. Magnetic excitations in hole-doped Sr2IrO4: Comparison with electron-doped cuprates. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.104414.
Clancy, J P, Gretarsson, H., Upton, M. H., Kim, Jungho, Cao, G., & Kim, Young-June. Magnetic excitations in hole-doped Sr2IrO4: Comparison with electron-doped cuprates. United States. doi:10.1103/PhysRevB.100.104414.
Clancy, J P, Gretarsson, H., Upton, M. H., Kim, Jungho, Cao, G., and Kim, Young-June. Tue . "Magnetic excitations in hole-doped Sr2IrO4: Comparison with electron-doped cuprates". United States. doi:10.1103/PhysRevB.100.104414.
@article{osti_1561218,
title = {Magnetic excitations in hole-doped Sr2IrO4: Comparison with electron-doped cuprates},
author = {Clancy, J P and Gretarsson, H. and Upton, M. H. and Kim, Jungho and Cao, G. and Kim, Young-June},
abstractNote = {We have studied the evolution of magnetic and orbital excitations as a function of hole doping in single-crystal samples of Sr2Ir1-xRhxO4(0.07≤x≤0.42) using high-resolution Ir L3-edge resonant inelastic x-ray scattering. Within the antiferromagnetically ordered region of the phase diagram (x≤0.17) we observe highly dispersive magnon and spin-orbit exciton modes. Interestingly, both the magnon gap energy and the magnon bandwidth appear to increase as a function of doping, resulting in a hardening of the magnon mode with increasing hole doping. As a result, the observed spin dynamics of hole-doped iridates more closely resemble those of the electron-doped, rather than hole-doped, cuprates. Within the paramagnetic region of the phase diagram (0.17≤x≤0.42) the low-lying magnon mode disappears, and we find no evidence of spin fluctuations in this regime. In addition, we observe that the orbital excitations become essentially dispersionless in the paramagnetic phase, indicating that magnetic order plays a crucial role in the propagation of the spin-orbit exciton},
doi = {10.1103/PhysRevB.100.104414},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = ,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}