Fingerprints of cluster-based Haldane and bound-magnon states in a spin-1 Heisenberg diamond chain

• URL: http://arxiv.org/abs/2510.18447v1
• Date: Tue, 21 Oct 2025 09:20:42 GMT
• Title: Fingerprints of cluster-based Haldane and bound-magnon states in a spin-1 Heisenberg diamond chain
• Authors: Azam Zoshki, Hamid Arian Zad, Katarina Karlova, Jozef Strecka,
• Abstract summary: We investigate magnetic and thermodynamic properties of a spin-1 Heisenberg diamond chain in a magnetic field.<n>We uncover a rich variety of unconventional quantum phases including uniform and cluster-based Haldane states.<n>We demonstrate that the frustrated spin-1 diamond chain can operate as an efficient working medium of a quantum Stirling engine.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate magnetic and thermodynamic properties of a spin-1 Heisenberg diamond chain in a magnetic field using a combination of analytical and numerical methods including the variational approach, exact diagonalization, density-matrix renormalization group, localized-magnon theory, and quantum Monte Carlo simulations. In the unfrustrated regime, the model exhibits a quantum ferrimagnetic phase that captures key magnetic features of the nickel-based polymeric compound [Ni3(OH)2(C4H2O4)(H2O)4].2H2O such as a at minimum in the temperature dependence of the susceptibility times temperature product and an intermediate one-third magnetization plateau. In the frustrated regime, we uncover a rich variety of unconventional quantum phases including uniform and cluster-based Haldane states, fragmented monomer-dimer phase, and bound-magnon crystals. Analysis of the adiabatic temperature change and magnetic Gruneisen parameter reveals an enhanced magnetocaloric effect near field-induced transitions between these exotic quantum phases. Additionally, we demonstrate that the frustrated spin-1 diamond chain can operate as an efficient working medium of a quantum Stirling engine, which approaches near-optimal efficiency when driven into these unconventional quantum states.

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