期刊
APPLIED PHYSICS LETTERS
卷 104, 期 22, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4880815
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资金
- National Center for Science (NCN) in Poland [DEC-2011/03/B/ST5/01019]
Temperature dependence of acoustic properties of [NH4][Mn(HCOO)(3)] and [NH4][Zn(HCOO)(3)] metal-organic frameworks was investigated by high-resolution micro-Brillouin scattering. Clear anomalies in the Brillouin shift and damping were observed near the transition temperature T-c upon cooling for the acoustic phonon corresponding to the c(11) elastic constant. Analysis of the acoustic anomalies showed that the order parameter exhibits critical slowing down near T-c with the relaxation time of similar order of magnitude as for other order-disorder ferroelectrics. (C) 2014 AIP Publishing LLC.
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