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Angle-resolved photoemission from FePt: Theory and experiment

Journal of Physics: Condensed Matter, ISSN: 0953-8984, Vol: 2, Issue: 23, Page: 5245-5252
1990
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Angle-resolved photoelectron spectra have been measured at room temperature (i.e. well below the Curie temperature) from the (001) surface of an Fe Pt single crystal for a variety of emission angles using unpolarised 21.2 eV radiation. Corresponding spectra were calculated by means of a one-step theory of photoemission together with the bulk band structure and the one-dimensional DOS. The fairly good overall agreement reached between theory and experiment firstly provides an explanation of the observed features in terms of direct bulk inter-band transitions from majority and minority spin states and secondly favours, amongst local density exchange-correlation approximations, an X version with alpha =0.7 around 2 eV below E and a somewhat smaller alpha closer to E.

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