Anomalous thermodynamics in a mixed spin-1/2 and spin-1 hexagonal nanowire system

Abstract

The mixed spin-1/2 Ising model and spin-1 Blume-Capel model in an hexagonal nanowire structure under the presence of crystal field is considered. The free energy is obtained through the transfer matrix technique, which is solved numerically. Our main result lies in the presence of pseudo-transition in low temperature region near the ferrimagnetic/ferromagnetic boundary, due to the influence of a crystal field. The evidence of a pseudo-transition is observed in several quantities. Free energy first derivative quantities like entropy and internal energy show an abrupt but continuous jump, whereas quantities associated with second derivatives of the free energy like the specific heat exhibit a strong sharp peak, quite similar to a second order phase transition. We also investigate magnetization patterns and do not find evidence of spontaneous magnetization. Nevertheless, assuming a small magnetic field, we can induce a magnetization which resembles a spontaneous magnetization at a pseudo-critical temperature.

13 pages, 15 figures

References in corpus (7)

• Microscopic origin of exchange bias in core/shell nanoparticles
• Vigorous thermal excitations in a double-tetrahedral chain of localized Ising spins and mobile electrons mimic a temperature-driven first-order phase transition
• Quasi-phases and pseudo-transitions in one-dimensional models with nearest neighbor interactions
• Thermodynamic and magnetic properties of the hexagonal type Ising nanowire
• Peculiarities in pseudo-transitions of a mixed spin-$(1/2,1)$ Ising-Heisenberg double-tetrahedral chain in an external magnetic field
• Anisotropy of the spin-orbit coupling driven by a magnetic field in InAs nanowires
• Low temperature pseudo-phase transition in an extended Hubbard diamond chain

Cited by in corpus (6)

• Pseudo-transition between antiferromagnetic and charge orders in a minimal spin-pseudospin model of one-dimensional cuprates
• 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
• Bifurcation in correlation length of the Ising model on a "Toblerone" lattice
• Spectral mechanism and nearly reducible transfer matrices for pseudotransitions in one-dimensional systems
• Thermodynamic constraints and pseudotransition behavior in a one-dimensional water-like system