Muon spin relaxation study of spin dynamics in the extended kagome systems YBaCo4O7+delta (delta=0,0.1)
- Authors
- Lee, S.; Lee, Wonjun; Lee, K. J.; Kim, ByungJun; Suh, B. J.; Zheng, H.; Mitchell, J. F.; Choi, K. -Y.
- Issue Date
- Mar-2018
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.97, no.10
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 97
- Number
- 10
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/1070
- DOI
- 10.1103/PhysRevB.97.104409
- ISSN
- 2469-9950
2469-9969
- Abstract
- We present muon spin relaxation (mu SR) measurements of the extended kagome systems YBaCo4O7+delta (delta = 0,0.1), comprising two interpenetrating kagome sublattice of Co(I)(3+) (S = 3/2) and a triangle sublattice of Co(II)(2+) (S = 2). The zero-and longitudinal-field mu SR spectra of the stoichiometric compound YBaCo4O7 unveil that the triangular subsystem orders at T-N = 101 K. In contrast, the muon spin relaxation rate pertaining to the kagome subsystem shows persistent spin dynamics down to T = 20 K and then a sublinear decrease lambda(T) similar to T-0.66(5) on cooling towards T = 4 K. In addition, the introduction of interstitial oxygen (delta = 0.1) is found to drastically affect the magnetism. For the fast-cooling experiment (> 10 K/min), YBaCo4O7.1 enters a regime characterized by persistent spin dynamics below 90 K. For the slow-cooling experiment (1 K/min), evidence is obtained for the phase separation into interstitial oxygen-poor and oxygen-rich regions with distinct correlation times. The observed temperature, cooling rate, and oxygen content dependencies of spin dynamics are discussed in terms of a broad range of spin-spin correlation times, relying on a different degree of frustration between the kagome and triangle sublattices as well as of oxygen migration.
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