Sektion Kristallographie

Links und Funktionen



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

EPL 104(1)

Autoren/Herausgeber: Gray AX
Minár J
Plucinski L
Huijben M
Bostwick A
Rotenberg E
Yang SH
Braun J
Winkelmann A
Conti G
Eiteneer D
Rattanachata A
Greer AA
Ciston J
Ophus C
Rijnders G
Blank DHA
Doennig D
Pentcheva R
Kortright JB
Schneider CM
Ebert H
Fadley CS
Erschienen: 2013
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.

Weiterführende Links