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We calculate the temperature-dependent magnetoelectric response of Cr2O3 fromfirst principles. The form of the dominant magnetoelectric coupling isdetermined using symmetry arguments, its strength is found using ab initiomethods, and the temperature dependence of the response is obtained from MonteCarlo simulations. The quantitative agreement of our results with experimentshows that the strong temperature dependence of the magnetoelectric effect inCr2O3 results from non-relativistic exchange interactions and spinfluctuations.

Microscopic theory of temperature-dependent magnetoelectric effect in Cr2O3