https://doi.org/10.1140/epjb/s10051-024-00710-7
Regular Article - Statistical and Nonlinear Physics
Pseudo-transition between antiferromagnetic and charge orders in a minimal spin-pseudospin model of one-dimensional cuprates
1
Department of Theoretical Physics and Astrophysics, Faculty of Science, P. J. Šafárik University, Park Angelinum 9, 040 01, Košice, Slovak Republic
2
Laboratoire de Physique Théorique et Modélisation, CY Cergy Paris Université, Avenue A. Chauvin, 95302, Pontoise, Cergy-Pontoise, France
Received:
1
April
2024
Accepted:
23
May
2024
Published online:
18
June
2024
This study rigorously investigates the phenomenon of a pseudo-transition in a minimal spin-pseudospin model, serving as a simplified model of one-dimensional cuprate chains [CuO]
, by making use of the transfer-matrix method. The studied spin-pseudospin model of one-dimensional cuprate chains [CuO] reveals a peculiar pseudo-transition between a charged-ordered phase and an antiferromagnetic phase, which is accompanied with anomalous behavior of magnetic and thermodynamic quantities. While the entropy and short-range correlations undergo near the pseudo-transition steep continuous changes reminiscent of a discontinuous phase transition, the specific heat displays a sizable sharp peak akin to a continuous phase transition.
© The Author(s) 2024
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