Spin-half Heisenberg antiferromagnet on a symmetric sawtooth chain: rotation-invariant Green’s functions and high-temperature series

Autor: Taras Hutak, Taras Krokhmalskii, Oleg Derzhko, Johannes Richter
Rok vydání: 2023
Předmět:
Zdroj: The European Physical Journal B. 96
ISSN: 1434-6036
1434-6028
DOI: 10.1140/epjb/s10051-023-00521-2
Popis: We apply the rotation-invariant Green's function method to study the finite-temperature properties of a $S{=}1/2$ sawtooth-chain (also called $\Delta$-chain) antiferromagnetic Heisenberg model at the fully frustrated point when the exchange couplings along the straight-line and zig-zag paths are equal. We also use 13 terms of high-temperature expansion series and interpolation methods to get thermodynamic quantities for this model. We check the obtained predictions for observable quantities by comparison with numerics for finite systems. Although our work refers to a one-dimensional case, the utilized methods work in higher dimensions too and are applicable for examining other frustrated quantum spin lattice systems at finite temperatures.
Comment: 13 pages, 8 figures
Databáze: OpenAIRE
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