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Publication . Article . Preprint . 2016

Observation of semilocalized dispersive states in the strongly correlated electron-doped ferromagnetEu1−xGdxO

Daniel Shai; Mark H. Fischer; A. Melville; Eric Monkman; John Harter; Dawei Shen; D. G. Schlom; +3 Authors
Open Access
Published: 17 Oct 2016 Journal: Physical Review B, volume 94 (issn: 2469-9950, eissn: 2469-9969, Copyright policy )
Publisher: American Physical Society (APS)
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 ${\mathrm{Eu}}_{1\ensuremath{-}x}{\mathrm{Gd}}_{x}\mathrm{O}$ 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 ${\mathrm{Eu}}_{1\ensuremath{-}x}{\mathrm{Gd}}_{x}\mathrm{O}$ and should be generally applicable for doped complex oxides.

Subjects by Vocabulary

Microsoft Academic Graph classification: Condensed matter physics Epitaxy Doping Quantum tunnelling Colossal magnetoresistance Physics Wave function Ferromagnetism Photoemission spectroscopy Curie temperature

arXiv: Condensed Matter::Strongly Correlated Electrons Condensed Matter::Materials Science Condensed Matter::Superconductivity

Subjects

Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), FOS: Physical sciences

27 references, page 1 of 3

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(2004). 11 D. E. Shai, A. J. Melville, J. W. Harter, E. J. Monkman,

Funded by
NSF| Navigating Frustration
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1308089
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Materials Research
,
NSF| NNIN: National Nanotechnology Infrastructure Network
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 0335765
  • Funding stream: Directorate for Engineering | Division of Electrical, Communications & Cyber Systems
,
NSF| Cornell Center for Materials Research - CEMRI
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1120296
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Materials Research
,
NSF| CAREER: Photoemission Spectroscopy of Thin Films : A New Laboratory for Studying Quantum Many-Body Interactions
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 0847385
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Materials Research
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