Magnetism and thermodynamics of spin-(1/2,1) decorated Heisenberg chain with spin-1 pendants

Abstract

The magnetic and thermodynamic properties of a new ferrimagnetic decorated spin-(1/2,1) Heisenberg chain with spin-1 pendant spins are investigated for three cases: (A) J1,J2>0; (B) J1>0, J2<0; and (C) J1<0, J2>0, where J1 and J2 are the exchange couplings between spins in the chain and along the rung, respectively. The low-lying and magnetic properties are explored jointly by the real-space renormalization group, spin wave, and density-matrix renormalization group methods, while the transfer-matrix renormalization group method is invoked to study the thermodynamics. It is found that the magnon spectra consist of a gapless and two gapped branches. Two branches in case (C) have intersections. The coupling dependence of low-energy gaps are analyzed. In a magnetic field, an m=3/2 (m is the magnetization per unit cell) plateau is observed for case (A), while two plateaux at m=1/2 and 3/2 are observed for cases (B) and (C). Between the two plateaux in cases (B) and (C), the sublattice magnetizations for the spins coupled by ferromagnetic interactions have novel decreasing regions with increasing the magnetic field. At finite temperature, the zero-field susceptibility temperature product chi*T and specific heat exhibit distinct exotic features with varying the couplings and temperature for different cases. chi*T is found to converge as T approaches zero, which is different from the divergent behavior in the spin-(1/2,1) mixed-spin chain without pendants. The observed thermodynamic behaviors are also discussed with the help of their low-lying excitations.

10 pages, 8 figures, accepted by Phys. Rev. B

References in corpus (8)

• Magnetism and Thermodynamics of Spin-1/2 Heisenberg Diamond Chains in a Magnetic Field
• Thermal entanglement of one-dimensional Heisenberg quantum spin chains in magnetic fields
• Quantum Phase Transition, O(3) Universality Class and Phase Diagram of Spin-1/2 Heisenberg Antiferromagnet on Distorted Honeycomb Lattice: A Tensor Renormalization Group Study
• Thermodynamics of spin-1/2 tetrameric Heisenberg antiferromagnetic chain
• Magnetization plateau and incommensurate spin modulation in Ca3Co2O6
• Antiferromagnetic and spin gap phases of the anisotropic Kondo necklace model
• Magnetization plateaux, Haldane-like gap, string order and hidden symmetry in a spin-1/2 tetrameric Heisenberg antiferromagnetic chain
• Phase diagram of the one dimensional anisotropic Kondo-necklace model

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• The role of density-dependent magnon hopping and magnon-magnon repulsion in ferrimagnetic spin-(1/2, $S$) chains in a magnetic field
• Effects of critical correlations on quantum percolation in two dimensions