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Momentum-resolved electronic structure at a buried interface from soft X-ray standing-wave angle-resolved photoemission
Gray, AX Minár, J Plucinski, L Huijben, M Bostwick, A Rotenberg, E Yang, SH Braun, J Winkelmann, A Conti, G
Gray, AX
Minár, J
Plucinski, L
Huijben, M
Bostwick, A
Rotenberg, E
Yang, SH
Braun, J
Winkelmann, A
Conti, G
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Journal Article
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2013-10-01
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10.1209/0295-5075/104/17004
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 La0.7Sr 0.3MnO3/SrTiO3. Depth-and momentum-resolved maps of Mn 3d eg and t2g states from the central, bulk-like and interface-like regions of La0.7Sr0.3MnO 3 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. © Copyright EPLA, 2013.
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