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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 |
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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 ($\varDelta_1-\varDelta_2$).
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Received: 06 May 2009
Revised: 30 May 2009
Accepted manuscript online:
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PACS:
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75.80.+q
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(Magnetomechanical effects, magnetostriction)
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75.50.Xx
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(Molecular magnets)
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75.30.Et
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(Exchange and superexchange interactions)
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75.30.Gw
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(Magnetic anisotropy)
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75.50.Ee
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(Antiferromagnetics)
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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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