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Chin. Phys. B, 2010, Vol. 19(2): 027503    DOI: 10.1088/1674-1056/19/2/027503
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Magnetoelastic instability in the XXZ rings with next-nearest neighbour coupling

Li Peng-Fei(李鹏飞) and Chen Zhong-Hua(陈中华)
Department of Mathematics and Physics, Shanghai University of Electric Power, Shanghai 200090, China
Abstract  This paper numerically investigates the magnetoelastic instability in the S = 1/2 XXZ rings containing finite spins N with antiferromagnetic nearest-neighbour (NN) and next-nearest neighbour (NNN) coupling. It finds that, as the NNanisotropy $\varDelta_1$ equals the NNN anisotropy $\varDelta_2$, there exists a critical NNN coupling strength $J_2^{\rm c}$ (≈0.5), at which the systems always locate in dimerized phase for arbitrary large spring constant. As $\varDelta_1\neq\varDelta_2$, the values of $J_2^{\rm c}$  are dependent on N and the difference of ($\varDelta_1-\varDelta_2$).
Keywords:  single molecular magnets      anisotropy      magnetoelastic instability  
Received:  06 May 2009      Revised:  30 May 2009      Accepted manuscript online: 
PACS:  75.80.+q (Magnetomechanical effects, magnetostriction)  
  75.50.Xx (Molecular magnets)  
  75.30.Et (Exchange and superexchange interactions)  
  75.30.Gw (Magnetic anisotropy)  
  75.50.Ee (Antiferromagnetics)  

Cite this article: 

Li Peng-Fei(李鹏飞) and Chen Zhong-Hua(陈中华) Magnetoelastic instability in the XXZ rings with next-nearest neighbour coupling 2010 Chin. Phys. B 19 027503

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