Quantum Phase Transitions in Alternating-Bond Mixed Diamond Chains with Spins 1 and 1/2

Abstract

We investigate the mixed diamond chain composed of spins 1 and 1/2 when the exchange interaction is alternatingly distorted. Depending on the strengths of frustration and distortion, this system has various ground states. Each ground state consists of an array of spin clusters separated by singlet dimers by virtue of an infinite number of local conservation laws. We determine the ground state phase diagram by numerically analyzing each spin cluster. In particular for strong distortion, we find an infinite series of quantum phase transitions by the cluster expansion method and conformal field theory. This leads to the infinite series of steps in the behavior of the Curie constant and residual entropy.

7 pages, 9 figures

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Cited by in corpus (10)

• Dynamic and thermodynamic properties of the generalised diamond chain model for azurite
• Magneto-thermal properties of the Heisenberg-Ising orthogonal-dimer chain with triangular XXZ-clusters
• Entanglement, magnetic and quadrupole moments properties of the mixed spin Ising-Heisenberg diamond chain
• Haldane Phases and Ferrimagnetic Phases with Spontaneous Translational Symmetry Breakdown in Distorted Mixed Diamond Chains with Spins 1 and 1/2
• Magnetic properties of the quantum spin-1/2 XX diamond chain: The Jordan-Wigner approach
• Ground State Phase Diagram of S=1 Diamond Chains
• Effects of Single-site Anisotropy on Mixed Diamond Chains with Spins 1 and 1/2
• Ground-State Phases of Alternating-Bond S = 1 Diamond Chains
• Ground-State Phases of Anisotropic Mixed Diamond Chains with Spins 1 and 1/2
• Coupled Cluster Treatment of the Alternating Bond Diamond Chain