Vigorous thermal excitations in a double-tetrahedral chain of localized Ising spins and mobile electrons mimic a temperature-driven first-order phase transition

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Lucia Gálisová, J Strečka

Abstract

A hybrid spin-electron system defined on a one-dimensional double-tetrahedral chain, in which the localized Ising spin regularly alternates with two mobile electrons delocalized over a triangular plaquette, is exactly solved with the help of generalized decoration-iteration transformation. It is shown that a macroscopic degeneracy of ferromagnetic and ferrimagnetic ground states arising from chiral degrees of freedom of the mobile electrons cannot be lifted by a magnetic field in contrast to a macroscopic degeneracy of the frustrated ground state, which appears due to a kinetically driven frustration of the localized Ising spins. An anomalous behavior of all basic thermodynamic quantities can be observed on account of massive thermal excitations, which mimic a temperature-driven first-order phase transition from the nondegenerate frustrated state to the highly degenerate ferrimagnetic state at nonzero magnetic fields. A substantial difference in the respective degeneracies is responsible for an immense low-temperature peak of the specific heat and very abrupt (almost discontinuous) thermal variations of the entropy and sublattice magnetizations.

References

Oct 4, 2003·Physical Review Letters·C D Batista, B S Shastry
Jul 23, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·F Mancini, F P Mancini
Apr 16, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·L GálisováT Verkholyak
Sep 26, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Onofre RojasN S Ananikian

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Citations

Sep 24, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Lucia Gálisová
Oct 4, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Onofre RojasS M de Souza
May 20, 2021·Physical Review. E·Onofre RojasM L Lyra

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