Journal
PHYSICAL REVIEW B
Volume 86, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.214423
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Funding
- US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- Center for Defect Physics, an Energy Frontier Research Center
- Department of Energy, Office of Advanced Scientific Computing Research
- Office of Science of the U.S. Department of Energy [DE-AC05-00OR22725]
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The most widely taught example of a magnetic transition is that of Fe at 1043 K. Despite the high temperature most discussions of this transition focus on the magnetic states of a fixed spin lattice with lattice vibrations analyzed separately and simply added. We propose a model of alpha iron that fully couples spin and displacement degrees of freedom. Results demonstrate a significant departure from models that treat these coordinates independently. The success of the model rests on a first principles calculation of changes in energy with respect to spin configurations on a bcc-iron lattice with displacements. Complete details of environment-dependent exchange interactions that augment the Finnis-Sinclair potential are given and comparisons to measurements are made. We find that coupling has no effect on critical exponents, a small effect on the transition temperature, T-c, and a large effect on the entropy of transformation. DOI: 10.1103/PhysRevB.86.214423
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