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arXiv · 2510.18447

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

Azam Zoshki·Hamid Arian Zad·Katarina Karlova·Jozef Strecka
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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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Azam Zoshki, Hamid Arian Zad, Katarina Karlova, Jozef Strecka. 2025-10-21. Fingerprints of cluster-based Haldane and bound-magnon states in a spin-1 Heisenberg diamond chain. https://doi.org/10.1088/2058-9565%2Fae49bb

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