Ground-State Phase Diagram of (1/2,1/2,1) Mixed Diamond Chains with Single-Site Anisotropy

Abstract

The ground-state phases of mixed diamond chains with ($S,{\tau }^{(1)},{\tau }^{(2)})=(1/2,1/2,1)$, where $S$ is the magnitude of vertex spins, and ${\tau }^{(1)}$ and ${\tau }^{(2)}$ are those of apical spins, are investigated with the single-site anisotropy $D$ on the ${\tau }^{(2)}$-site. The two apical spins in each unit cell are coupled by an exchange coupling $\lambda$. The vertex spins are coupled with the top and bottom apical spins by exchange couplings $1+\delta$ and $1-\delta$, respectively. The ground-state phase diagram is determined using the numerical exact diagonalization and DMRG method in addition to the analytical approximations in various limiting cases. The phase diagram consists of a Néel ordered phase, a nonmagnetic Tomonaga-Luttinger liquid phase, and quantized and partial ferrimagnetic phases. A region with anisotropy inversion is found where the Ising-like Néel phase is realized for the easy-plane anisotropy $D>0$ and the XY-like Tomonaga-Luttinger liquid phase is realized for the easy-axis anisotropy $D<0$ on the $S=1$ sites.

5 pages, 5 figures

References in corpus (3)

• Ground State Phase Diagram of S=1 Diamond Chains
• Infinite Series of Ferrimagnetic Phases Emergent from the Gapless Spin Liquid Phase of Mixed Diamond Chains
• Ground-State Phase Diagram of (1/2,1/2,1) Mixed Diamond Chains