Momentum-resolved electronic structure at a buried interface from soft X-ray standing-wave angle-resolved photoemission

A.X. Gray, J. Minar, L. Plucinski, Mark Huijben, A. Bostwick, E. Rotenberg, S.-H. Yang, J. Braun, A. Winkelmann, G. Conti, D. Eiteneer, A. Rattanachata, A.A. Greer, J. Ciston, C. Ophus, Augustinus J.H.M. Rijnders, David H.A. Blank, D. Doennig, R. Pentcheva, J.B. KortrightC.M. Schneider, H. Ebert, C.S. Fadley

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Abstract

Angle-resolved photoemission spectroscopy (ARPES) is a powerful technique for the study of electronic structure, but it lacks a direct ability to study buried interfaces between two materials. We address this limitation by combining ARPES with soft X-ray standing-wave (SW) excitation (SWARPES), in which the SW profile is scanned through the depth of the sample. We have studied the buried interface in a prototypical magnetic tunnel junction La0.7Sr0.3MnO3/SrTiO3. Depth-and momentum-resolved maps of Mn 3d eg and t2g states from the central, bulk-like and interface-like regions of La0.7Sr0.3MnO3 exhibit distinctly different behavior consistent with a change in the Mn bonding at the interface. We compare the experimental results to state-of-the-art density-functional and one-step photoemission theory, with encouraging agreement that suggests wide future applications of this technique.
Original languageUndefined
Article number17004
Pages (from-to)-
Number of pages6
JournalEurophysics letters
Volume104
Issue number1
DOIs
Publication statusPublished - 2013

Keywords

  • METIS-298384
  • IR-90017

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