Magnetic field effects on two-leg Heisenberg antiferromagnetic ladders: Thermodynamic properties

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  • 27 June 1999
Abstract
Using the recently developed transfer-matrix renormalization group method, we establish a quantitative magnetic phase diagram of two-leg antiferromagnetic ladders. It contains disordered spin liquid, Luttinger liquid, spin-polarized phases and a classical regime. The boundaries between these regimes are determined by identifying the critical behavior of magnetization. Our findings in the low temperature regime clearly show that the divergence of the NMR relaxation rate observed on Cu_2(C_5H_{12}N_2)_2Cl_4 can be well explained by the intrinsic properties of quasi-one-dimensional spin-gapped systems. The magnetic field effects on the specific heat are also considered in detail.

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