Origin of mean-field behavior in an elastic Ising model

Autor(en)

Layne B. Frechette, Christoph Dellago, Phillip L. Geissler

Abstrakt

Simple elastic models of spin-crossover compounds are known empirically to exhibit classical critical behavior. We demonstrate how the long-range interactions responsible for this behavior arise naturally upon integrating out mechanical fluctuations of such a model. A mean-field theory applied to the resulting effective Hamiltonian quantitatively accounts for both thermodynamics and kinetics observed in computer simulations, including a barrier to magnetization reversal that grows extensively with system size. For nanocrystals, which break translational symmetry, a straightforward extension of mean-field theory yields similarly accurate results.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie, Forschungsplattform Internationales Erwin Schrödinger Institut für Mathematik und Physik

Externe Organisation(en)

University of California, Berkeley, Erwin Schrödinger Institut

Journal

Physical Review B

Band

102

Anzahl der Seiten

9

ISSN

2469-9950

DOI

https://doi.org/10.1103/PhysRevB.102.024102

Publikationsdatum

07-2020

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie, 103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ba0a3952-562d-4a81-b6c2-0f809afa63c5