Unconventional low temperature features in the one-dimensional frustrated $q$-state Potts model

Abstract

Here we consider a one-dimensional $q$-state Potts model with an external magnetic field and an anisotropic interaction that selects neighboring sites that are in the spin state 1. The present model exhibits an unusual behavior in the low-temperature region, where we observe an anomalous vigorous change in the entropy for a given temperature. There is a steep behavior at a given temperature in entropy as a function of temperature, quite similar to first-order discontinuity, but there is no jump in the entropy. Similarly, second derivative quantities like specific heat and magnetic susceptibility also exhibit a strong acute peak rather similar to second-order phase transition divergence, but once again there is no singularity at this point. Correlation length also confirms this anomalous behavior at the same given temperature, showing a strong and sharp peak which easily one may confuse with a divergence. The temperature where occurs this anomalous feature we call pseudo-critical temperature. We have analyzed physical quantities, like correlation length, entropy, magnetization, specific heat, magnetic susceptibility, and distant pair correlation functions. Furthermore, we analyze the pseudo-critical exponent that satisfy a class of universality previously identified in the literature for other one-dimensional models, these pseudo-critical exponents are: for correlation length $\nu =1$, specific heat $\alpha =3$ and magnetic susceptibility $\mu =3$.

15 pages, 11 figures, submitted to Physical Review E

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• Unusual low-temperature behavior in the half-filled band of the one-dimensional extended Hubbard model in atomic limit
• Pseudotransitions in a dilute Ising chain
• Thermodynamic features of the 1D dilute Ising model in the external magnetic field
• Zero temperature phase transitions and their anomalous influence on thermodynamic behavior in the q-state Potts model on a diamond chain
• Bifurcation in correlation length of the Ising model on a "Toblerone" lattice
• Quantum Otto engine mimicking Carnot near pseudotransitions in the one-dimensional extended Hubbard model in the atomic limit
• Dual thermal pseudocritical features in a spin-1/2 Ising chain with twin-diamond geometry
• Thermodynamic constraints and pseudotransition behavior in a one-dimensional water-like system
• Spectral mechanism and nearly reducible transfer matrices for pseudotransitions in one-dimensional systems
• Half-ice, half-fire-driven ultranarrow phase crossover in one-dimensional decorated $q$-state Potts ferrimagnets: An AI-co-led exploration