Observation of semilocalized dispersive states in the strongly correlated electron-doped ferromagnet Eu1-xGdx O

D. E. Shai, M. H. Fischer, A. J. Melville, E. J. Monkman, J. W. Harter, D. W. Shen, D. G. Schlom, M. J. Lawler, E. A. Kim, K. M. Shen

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Abstract

Chemical substitution plays a key role in controlling the electronic and magnetic properties of complex materials. For instance, in EuO, carrier doping can induce a spin-polarized metallic state and colossal magnetoresistance, and significantly enhance the Curie temperature. Here, we employ a combination of molecular-beam epitaxy, angle-resolved photoemission spectroscopy, and an effective model calculation to investigate and understand how semilocalized states evolve in lightly electron-doped Eu1-xGdxO above the ferromagnetic Curie temperature. Our studies reveal a characteristic length scale for the spatial extent of the donor wave functions which remains constant as a function of doping, consistent with recent tunneling studies of doped EuO. Our work sheds light on the nature of the semiconductor-to-metal transition in Eu1-xGdxO and should be generally applicable for doped complex oxides.

Original languageEnglish
Article number195102
JournalPhysical Review B
Volume94
Issue number19
DOIs
StatePublished - 1 Nov 2016

Bibliographical note

Funding Information:
This work was performed in part at the Cornell NanoScale Facility, a member of the National Nanotechnology Infrastructure Network, which is supported by the National Science Foundation (Grant No. ECCS-0335765). M.H.F acknowledges support from the Swiss Society of Friends of the Weizmann Institute of Science. D.E.S. acknowledges support from the National Science Foundation under Grant No. DGE-0707428 and NSF IGERT under Grant No. DGE-0654193.

Publisher Copyright:
© 2016 American Physical Society.

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