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Evaluation of the coupling parameters of many-body interactions in Fe(110)

DOI: 10.1103/PhysRevB.82.195132 DOI Help

Authors: X. Y. Cui (Hiroshima University) , K. Shimada (Hiroshima University) , Y. Sasisaka (Hirosaki University) , H. Kato (Hirosaki University) , M. Hoesch (Diamond Light Source) , T. Oguchi (Hiroshima University) , Y. Aiura (National Institute of Advanced Industrial Science and Technology) , H. Namatame (Hiroshima University) , M. Taniguchi (Hiroshima Synchrotron Radiation Center; Hiroshima University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 82 (19) , PAGES 195132

State: Published (Approved)
Published: November 2010

Abstract: In order to clarify many-body interactions in ferromagnetic iron, we performed high-resolution angle-resolved photoemission spectroscopy (ARPES) on a Fe(110) single crystal. We quantitatively analyzed the ARPES line shapes for a majority-spin band crossing the Fermi level (EF). The observed group velocity was reduced with respect to the band-structure calculation by a factor of 1/2.7, giving a coupling parameter due to the electron-electron interaction of λee=1.7±0.1. This suggests a strong electron correlation in Fe 3d, which is consistent with recent high-resolution ARPES results. The real and imaginary parts of the self-energy have been experimentally evaluated near EF. The coupling parameter of the electron-phonon interaction was estimated to be λep=0.16±0.02, which is 1/10 of λee. The effective-mass enhancement with respect to the band mass m∗/mb∼1+λee+λep∼3 was, therefore, mainly caused by electron correlation.

Subject Areas: Physics


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