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Spin dynamics in Heisenberg triangular antiferromagnets: A mu SR study of LiCrO(2)

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Title Spin dynamics in Heisenberg triangular antiferromagnets: A mu SR study of LiCrO(2)
 
Creator OLARIU, A
MENDELS, P
BERT, F
ALEXANDER, LK
MAHAJAN, AV
HILLIER, AD
AMATO, A
 
Subject exchange integrals
lattice
oxides
nacro2
antiferromagnetic materials
excited states
heisenberg model
lithium compounds
magnetic structure
magnetic transition temperature
muon probes
spin dynamics
 
Description We report a mu SR study of LiCrO(2), which has a magnetic lattice made up of a stacking of triangular Heisenberg antiferromagnetic (Cr(3+), S=3/2) layers. A static magnetically ordered state is observed below the transition temperature T(N)=62 K, while the expected peak of the relaxation rate is slightly shifted downward by a few kelvins below T(N). We draw a comparison with the isostructural compound NaCrO(2), where an exotic broad fluctuating regime has been observed [A. Olariu, P. Mendels, F. Bert, B. G. Ueland, P. Schiffer, R. F. Berger, and R. J. Cava, Phys. Rev. Lett. 97, 167203 (2006)] and was suggested to originate from topological excitations of the triangular lattice. Replacing Na by Li strongly narrows the exotic fluctuating regime formerly observed in NaCrO(2), which we attribute to a more pronounced interplane coupling in LiCrO(2).
 
Publisher AMER PHYSICAL SOC
 
Date 2011-07-17T00:02:23Z
2011-12-26T12:50:01Z
2011-12-27T05:35:56Z
2011-07-17T00:02:23Z
2011-12-26T12:50:01Z
2011-12-27T05:35:56Z
2009
 
Type Article
 
Identifier PHYSICAL REVIEW B, 79(22), -
1098-0121
http://dx.doi.org/10.1103/PhysRevB.79.224401
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4565
http://hdl.handle.net/10054/4565
 
Language en