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Equilibrium, metastability, and hysteresis in a model spin-crossover material with nearest-neighbor antiferromagnetic-like and long-range ferromagnetic-like interactions

Title: Equilibrium, metastability, and hysteresis in a model spin-crossover material with nearest-neighbor antiferromagnetic-like and long-range ferromagnetic-like interactions.
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Name(s): Rikvold, Per Arne, author
Brown, Gregory, author
Miyashita, Seiji, author
Omand, Conor, author
Nishino, Masamichi, author
Type of Resource: text
Genre: Text
Date Issued: 2016-02-16
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Phase diagrams and hysteresis loops were obtained by Monte Carlo simulations and a mean- field method for a simplified model of a spin-crossovermaterialwith a two-step transition between the high-spin and low-spin states. This model is a mapping onto a square-lattice S = 1/2 Ising model with antiferromagnetic nearest-neighbor and ferromagnetic Husimi-Temperley ( equivalent-neighbor) long-range interactions. Phase diagrams obtained by the two methods for weak and strong long-range interactions are found to be similar. However, for intermediate-strength long-range interactions, the Monte Carlo simulations show that tricritical points decompose into pairs of critical end points and mean-field critical points surrounded by horn-shaped regions of metastability. Hysteresis loops along paths traversing the horn regions are strongly reminiscent of thermal two-step transition loops with hysteresis, recently observed experimentally in several spin-crossover materials. We believe analogous phenomena should be observable in experiments and simulations for many systems that exhibit competition between local antiferromagnetic-like interactions and long-range ferromagnetic-like interactions caused by elastic distortions.
Identifier: FSU_libsubv1_wos_000370244600002 (IID), 10.1103/PhysRevB.93.064109 (DOI)
Keywords: critical-behavior, intermediate phase, iron(ii) complex, ising-models, point, pressure, size, Spectroscopy, temperature, transitions
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1103/PhysRevB.93.064109
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000370244600002
Owner Institution: FSU
Is Part Of: Physical Review B.
2469-9950
Issue: iss. 6, vol. 93

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Rikvold, P. A., Brown, G., Miyashita, S., Omand, C., & Nishino, M. (2016). Equilibrium, metastability, and hysteresis in a model spin-crossover material with nearest-neighbor antiferromagnetic-like and long-range ferromagnetic-like interactions. Physical Review B. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000370244600002