An exactly solved 1D mixed-spin chain shows finite-temperature pseudo-transitions near five ground-state phase boundaries, including an interface between two non-degenerate ferrimagnetic phases.
Anomalous thermodynamic response in the vicinity of pseudo-transition of a spin-1/2 Ising diamond chain
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abstract
The spin-1/2 Ising diamond chain in a magnetic field displays a remarkable pseudo-transition whenever it is driven sufficiently close to a ground-state phase boundary between a classical ferrimagnetic phase and a highly degenerate frustrated phase. The pseudo-transition of the spin-1/2 Ising diamond chain relates to intense thermal excitations from a nondegenerate ferrimagnetic ground state to a highly degenerate manifold of excited states with a frustrated character, which are responsible for an anomalous behavior of thermodynamic quantities. Temperature dependences of entropy and specific heat are indeed reminiscent of a temperature-driven phase transition of a discontinuous (entropy) or continuous (specific heat) nature though there are no true singularities of these thermodynamic quantities at a pseudo-critical temperature.
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cond-mat.stat-mech 1years
2019 1verdicts
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Peculiarities in pseudo-transitions of a mixed spin-$(1/2,1)$ Ising-Heisenberg double-tetrahedral chain in an external magnetic field
An exactly solved 1D mixed-spin chain shows finite-temperature pseudo-transitions near five ground-state phase boundaries, including an interface between two non-degenerate ferrimagnetic phases.