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A hybrid spin-electron system defined on one-dimensional double-tetrahedralchain, in which the localized Ising spin regularly alternates with two mobileelectrons delocalized over a triangular plaquette, is exactly solved with thehelp of generalized decoration-iteration transformation. It is shown that amacroscopic degeneracy of ferromagnetic and ferrimagnetic ground states arisingfrom chiral degrees of freedom of the mobile electrons cannot be lifted by amagnetic field in contrast to a macroscopic degeneracy of the frustrated groundstate, which appears owing to a kinetically-driven frustration of the localizedIsing spins. An anomalous behavior of all basic thermodynamic quantities can beobserved on account of massive thermal excitations, which mimic atemperature-driven first-order phase transition from the non-degeneratefrustrated state to the highly degenerate ferrimagnetic state at non-zeromagnetic fields. A substantial difference in the respective degeneracies isresponsible for an immense low-temperature peak of the specific heat and veryabrupt (almost discontinuous) thermal variations of the entropy and sublatticemagnetizations.

physical review. e, statistical, nonlinear and soft matter physics

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