Quantum critical nature of the short-range magnetic order in Sr2-xLaxIrO4
- Authors
- Rodan, S.T.; Yoon, S.; Lee, S.; Choi, K.-Y.; Kim, G.; Rhyee, J.-S.; Koda, A.; Chen, W.-T.; Chou, F.
- Issue Date
- Dec-2018
- Publisher
- American Physical Society
- Citation
- Physical Review B, v.98, no.21
- Journal Title
- Physical Review B
- Volume
- 98
- Number
- 21
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18949
- DOI
- 10.1103/PhysRevB.98.214412
- ISSN
- 2469-9950
2469-9969
- Abstract
- We have investigated the nature of the short-range magnetic phase region of Sr2-xLaxIrO4 (0≤x≤0.14). This so-called spin-orbit Mott insulator's predicted transition to superconductivity with electron doping has remained elusive. Instead, short-range magnetism prevails over an extensive doping range up to the La solubility limit. We find evidence for quantum critical-like fluctuations of the short-range magnetic phase, in both a scaling relation of the ac susceptibility χTα and the magnetization MTα-1 with α=0.4-0.5, as well as in the time-field scaling (t/Hγ) of the μSR asymmetry function. Our combined study of ac susceptibility and μSR, on the one hand, uncovers a two-stage weak symmetry breaking to spin freezing or proximate spin glass and to a subsequent spin glass within the short-range magnetic phase. On the other hand, we demonstrate that magnetic correlations become more static above x=0.06 in spite of an apparent dilution of magnetic moments, indicative of enhanced inhomogeneities in a higher La-doping regime. © 2018 American Physical Society.
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