Anomalous spin dynamics in CdCu2(BO3)(2) revealed by B-11 NMR and ZF-mu SR
- Authors
- Lee, W. -J.; Do, S. -H.; Yoon, Sungwon; Jang, Z. H.; Suh, B. J.; Lee, J. H.; Reyes, A. P.; Kuhns, P. L.; Luetkens, H.; Choi, K. -Y.
- Issue Date
- 4-Dec-2014
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.90, no.21
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 90
- Number
- 21
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/11499
- DOI
- 10.1103/PhysRevB.90.214416
- ISSN
- 1098-0121
1550-235X
- Abstract
- We report B-11 nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-mu SR) measurements of the anisotropic spin tetramer system CdCu2(BO3)(2), which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at T-N = 9.8 K by a critical divergence of the nuclear spin-lattice relaxation rate 1/T-1 and an appearance of well-defined muon-spin precessions. In addition, we find the spectroscopic signature for a magnetic anomaly at T* = 6.5 K, a few kelvins below TN. For temperatures below T*, 1/T-1 ceases to follow a T-4.9(1) behavior. Instead, upon cooling below T*, both 1/T-1 and 1/T-2 become temperature-independent with a subsequent small drop. The muon frequency and the relative fraction of the Cu magnetic sites show anomalies mostly for Cu(2) spins at T*. This is ascribed to a Cu(2) spin reorientation. Site-specific change in magnetic structure is discussed in terms of the energy hierarchy of involved exchange interactions and an additional intertetramer interaction that controls magnetism at temperature T*.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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