Thermodynamic Properties of Three-Dimensional Orthogonal Dimer Model for SrCu₂(BO₃)₂

2000/04/16 by Miyahara, Shin, Ueda, Kazuo · 1 citation
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.cond-mat/0004260

Abstract

Effects of the inter-layer couplings for the orthogonal dimer system SrCu₂(BO₃)₂ are discussed. The spin-gap Δ of the three-dimensional model is independent of the inter-layer couplings when they are small. Therefore at low temperatures (T < Δ) thermodynamic properties are described well by the two-dimensional model. On the other hand at high temperatures the mean-field type scaling ansatz is useful to discuss the magnetic susceptibility for week inter-layer couplings. From fit of the magnetic susceptibility, the estimated coupling constants are J = 85 K for the nearest-neighbor couplings, J^' = 54 K for the next-nearest-neighbor couplings, and J^'' = 8 K for the inter-layer couplings. These parameters are consistent with the temperature dependence of the specific heat at low temperatures.

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• Numerical Block-Diagonalization and Linked Cluster Expansion for Deriving Effective Hamiltonians: Applications to Spin Excitations

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