Magnetization plateau in diamond chains with delocalized interstitial spins

M. S. S. Pereira; F. A. B. F. de Moura; M. L. Lyra

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Magnetization plateau in diamond chains with delocalized interstitial spins

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Several low-dimensional magnetic compounds exhibit magnetization plateaus as a result of the interplay between frustration and quantum fluctuations. Here, we investigate the thermodynamic properties of diamond chains on which competing interactions emerge from the local quantum hopping of interstitial S=1/2 spins which are intercalated between nodal Ising spins. Using an exact diagonalization and the decoration-iteration transformation, we compute the temperature and external field dependences of the magnetization, specific heat, susceptibility, and the full ground state phase diagram. Magnetization plateaus of 1/3 are observed and related to field-driven transitions among four possible ground states: saturated paramagnetic, unsaturated paramagnetic, ferrimagnetic, and nodal antiferromagnetic. There is a range of hopping amplitudes and exchange mismatches for which the 1/3 magnetization plateau occurs between finite values of the external field. The specific heat and magnetic susceptibility also show signatures of the competition between the possible ground states.

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《Physical review, B. Condensed matter and materials physics》 |2008年第2期|024402.1-024402.8|共9页
作者
M. S. S. Pereira; F. A. B. F. de Moura; M. L. Lyra;
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作者单位

Instituto de Fisica, Universidade Federal de Alagoas, 57072-970 Maceio, Alagoas, Brazil;

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正文语种英语
中图分类固体物理学;
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spin chain models; static properties (order parameter; static susceptibility; heat capacities; critical exponents; etc.); ferrimagnetics; quantized spin models;

Magnetization plateau in diamond chains with delocalized interstitial spins

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