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

X. Chen (), Q. Jiang and W. Shen

The European Physical Journal B: Condensed Matter and Complex Systems, 2004, vol. 37, issue 2, 169-175

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)(D 2 O) 3 · D 2 O at low temperatures. Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2004

Date: 2004
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DOI: 10.1140/epjb/e2004-00043-y

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