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Thermodynamic properties of an alternating-spin (1/2,1) two-leg ladder

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Abstract

With the aid of the Schwinger-boson mean-field method, we study the low-lying excitations and thermodynamic properties of a ferrimagnetic Heisenberg two-leg ladder (i.e., a ferrimagnetic double-chain with an antiferromagnetic interaction). The interaction between the two chains plays an important role in producing a low-lying excitation energy gap, affecting the low-lying excited spectrum, and increasing the disorder of the ferrimagnetic double-chain. The excitation spectrum, energy gap, and spin reduction in the ground state are calculated. Thermodynamic quantities such as the short-range spin correlation and short-range order are also obtained at low temperatures. In this gapful system, we observed the exponential behaviors in both the specific heat (C V ) and the product of magnetic susceptibility and temperature (χT) at low temperatures. The exponential behavior of the χT versus temperature agrees qualitatively with the experimental results in NiCu(pba)(D2O)3 · D2O at low temperatures.

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Authors and Affiliations

  1. Laboratory of Condensed Matter Spectroscopy and Opto-Electronic Physics, Department of Physics, Shanghai Jiao Tong University, 1954 Hua Shan Road, 200030, Shanghai, P.R. China

    X. Y. Chen & W. Z. Shen

  2. Department of Physics, Suzhou University, 215006, Suzhou, P.R. China

    Q. Jiang

Authors
  1. X. Y. Chen
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  2. Q. Jiang
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  3. W. Z. Shen
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Corresponding author

Correspondence to X. Y. Chen.

Additional information

Received: 24 October 2003, Published online: 15 March 2004

PACS:

75.10.Jm Quantized spin models - 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) - 75.50.Ee Antiferromagnetics - 75.50.Gg Ferrimagnetics

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Chen, X.Y., Jiang, Q. & Shen, W.Z. Thermodynamic properties of an alternating-spin (1/2,1) two-leg ladder. Eur. Phys. J. B 37, 169–175 (2004). https://doi.org/10.1140/epjb/e2004-00043-y

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