Magnetic tight-binding and the iron-chromium enthalpy anomaly

Details Magnetic tight-binding and the iron-chromium enthalpy anomaly Magnetic tight-binding and the iron-chromium enthalpy anomaly

2007-10-24

arxiv.org/abs/0710.4399v1

Physics

Condensed Matter

Materials Science

Submitted to Phys Rev B

Scientific paper

10.1103/PhysRevB.77.024428

We describe a self consistent magnetic tight-binding theory based in an expansion of the Hohenberg-Kohn density functional to second order, about a non spin polarised reference density. We show how a first order expansion about a density having a trial input magnetic moment leads to the Stoner--Slater rigid band model. We employ a simple set of tight-binding parameters that accurately describes electronic structure and energetics, and show these to be transferable between first row transition metals and their alloys. We make a number of calculations of the electronic structure of dilute Cr impurities in Fe which we compare with results using the local spin density approximation. The rigid band model provides a powerful means for interpreting complex magnetic configurations in alloys; using this approach we are able to advance a simple and readily understood explanation for the observed anomaly in the enthalpy of mixing.

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