Magnetization plateaus, spin-canted orders and field-induced transitions in a spin-1/2 Heisenberg antiferromagnet on a distorted diamond-decorated honeycomb lattice

TL;DR

This study explores the complex magnetic phases and magnetization plateaus in a spin-1/2 Heisenberg antiferromagnet on a distorted honeycomb lattice, revealing rich quantum phenomena and thermal effects through advanced computational methods.

Contribution

It provides a comprehensive phase diagram and identifies robust magnetization plateaus in a frustrated quantum spin system using multiple numerical techniques.

Findings

Multiple quantum phases including ferrimagnetic, ferromagnetic, and canted states identified.

Magnetization plateaus at 0, 1/4, 1/2, and 3/4 saturation observed.

Thermal fluctuations smear plateau structures, captured by an effective lattice-gas model.

Abstract

We investigate the spin-1/2 Heisenberg antiferromagnet on a distorted diamond-decorated honeycomb lattice in an external magnetic field. By combining density-matrix renormalization group, sign-problem-free quantum Monte Carlo in a mixed dimer-monomer basis, exact diagonalization, and an effective lattice-gas approach, we determine the ground-state phase diagram and analyze the finite-temperature magnetization process. The model hosts a rich variety of frustration-induced quantum phases including a quantum ferrimagnetic phase of Lieb-Mattis type, a quantum ferromagnetic phase, a spin-canted phase, a monomer-dimer phase, a dimer-tetramer liquid, a dimer-tetramer solid, and two distinct one-dimensional-crossover phases of ferromagnetic and ferrimagnetic character. Depending on the lattice distortion, we identify robust magnetization plateaus at 0, 1/4, 1/2, and 3/4 of the saturation magnetization originating from competing local dimer and tetramer singlets. Finite-temperature QMC data reveal how thermal fluctuations progressively smear the plateau structure, while the effective lattice-gas description reliably captures the corresponding low-temperature behavior.