Spin dynamics of the S=5/2 2D triangular antiferromagnet Ba3NbFe3Si2O14
- Authors
- Choi, K. Y.; Wang, Z.; Ozarowski, A.; van Tol, J.; Zhou, H. D.; Wiebe, C. R.; Skourski, Y.; Dalal, N. S.
- Issue Date
- Jun-2012
- Publisher
- IOP PUBLISHING LTD
- Citation
- JOURNAL OF PHYSICS-CONDENSED MATTER, v.24, no.24
- Journal Title
- JOURNAL OF PHYSICS-CONDENSED MATTER
- Volume
- 24
- Number
- 24
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/20243
- DOI
- 10.1088/0953-8984/24/24/246001
- ISSN
- 0953-8984
1361-648X
- Abstract
- We report pulse-field magnetization, ac susceptibility, and 100 GHz electron spin resonance (ESR) measurements on the S = 5/2 two-dimensional triangular compound Ba3NbFe3Si2O14 with the Neel temperature T-N = 26 K. The magnetization curve shows an almost linear increase up to 60 T with no indication of a one-third magnetization plateau. An unusually large frequency dependence of the ac susceptibility in the temperature range of T = 20-100 K reveals a spin-glass behavior or superparamagnetism, signaling the presence of frustration-related slow magnetic fluctuations. The temperature dependence of the ESR linewidth exhibits two distinct critical regimes; (i) Delta HppT proportional to (T - T-N)(-p) with the exponent p = 0.2.(1)-0.2(3) for temperatures above 27 K, and (ii) Delta H-pp(T) proportional to (T - T*)(-p) with T* = 12 K and p = 0.8(1)-0.8(4) for temperatures between 12 and 27 K. This is interpreted as indicating a dimensional crossover of magnetic interactions and the persistence of short-range correlations with a helically ordered state.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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