Magnetic properties of the $S=1/2$ distorted diamond chain at T=0

Abstract

We explore, at T=0, the magnetic properties of the $S=1/2$ antiferromagnetic distorted diamond chain described by the Hamiltonian ${\cal H} = \sum_{j=1}^{N/3}{J_1 ({\bi S}_{3j-1} \cdot {\bi S}_{3j} + {\bi S}_{3j} \cdot {\bi S}_{3j+1}) + J_2 {\bi S}_{3j+1} \cdot {\bi S}_{3j+2} + J_3 ({\bi S}_{3j-2} \cdot {\bi S}_{3j} + {\bi S}_{3j} \cdot {\bi S}_{3j+2})} \allowbreak - H \sum_{l=1}^{N} S_l^z $ with $J_1,J_2,J_3\ge 0$, which well models ${\mathrm{A}}_3\mathrm{C}{\mathrm{u}}_3(\mathrm{P}{\mathrm{O}}_4{)}_4$ with $\mathrm{A}=\mathrm{Ca},\mathrm{Sr}$, $\mathrm{B}{\mathrm{i}}_4\mathrm{C}{\mathrm{u}}_3{\mathrm{V}}_2{\mathrm{O}}_{14}$ and azurite $\mathrm{C}{\mathrm{u}}_3(\mathrm{OH}{)}_2(\mathrm{C}{\mathrm{O}}_3{)}_2$. We employ the physical consideration, the degenerate perturbation theory, the level spectroscopy analysis of the numerical diagonalization data obtained by the Lanczos method and also the density matrix renormalization group (DMRG) method. We investigate the mechanisms of the magnetization plateaux at $M=M_s/3$ and $M=(2/3)M_s$, and also show the precise phase diagrams on the $(J_2/J_1,J_3/J_1)$ plane concerning with these magnetization plateaux, where $M={\sum }_{l=1}^N{S}_l^z$ and $M_s$ is the saturation magnetization. We also calculate the magnetization curves and the magnetization phase diagrams by means of the DMRG method.

21 pages, 29 figures

References in corpus (2)

• Possible Quasi-One-Dimensional Fermi Surface in La_{2-x}Sr_{x}CuO_4
• Magnetic properties of the $S=1/2$ distorted diamond chain at T=0

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