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Title: Role of Ce 4 f hybridization in the origin of magnetism in nanoceria

Abstract

Nanoscale CeO 2 (nanoceria) is a prototypical system that presents d 0 ferromagnetism. Here, using a combination of x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and modeling, we show that the nanostructure, defects and disorder, and nonstoichiometry create magnetically polarized Ce 4 f and O 2p hybridized states captured by the vacancy orbitals ( V orb) that are vital to ferromagnetism. Further, we demonstrate that foreign ions (Fe and Co) enhance the moment at Ce 4 f sites while the number of V orb is unchanged, pointing clearly to the mechanism of orbital hybridization being the key missing ingredient to understanding the unexpected ferromagnetism in many nanoscale dilute magnetic oxides and semiconductors.

Authors:
 [1];  [2];  [2];  [3];  [1]
  1. Univ. of Manitoba, Winnipeg, MB (Canada)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Toyota Motor Engineering and Manufacturing North America Inc., Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Natural Sciences and Engineering Research Council of Canada (NSERC); Canada Foundation for Innovation (CFI); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1572694
Alternate Identifier(s):
OSTI ID: 1510837
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Paidi, V. K., Brewe, D. L., Freeland, J. W., Roberts, C. A., and van Lierop, Johan. Role of Ce 4f hybridization in the origin of magnetism in nanoceria. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.180403.
Paidi, V. K., Brewe, D. L., Freeland, J. W., Roberts, C. A., & van Lierop, Johan. Role of Ce 4f hybridization in the origin of magnetism in nanoceria. United States. doi:10.1103/PhysRevB.99.180403.
Paidi, V. K., Brewe, D. L., Freeland, J. W., Roberts, C. A., and van Lierop, Johan. Mon . "Role of Ce 4f hybridization in the origin of magnetism in nanoceria". United States. doi:10.1103/PhysRevB.99.180403.
@article{osti_1572694,
title = {Role of Ce 4f hybridization in the origin of magnetism in nanoceria},
author = {Paidi, V. K. and Brewe, D. L. and Freeland, J. W. and Roberts, C. A. and van Lierop, Johan},
abstractNote = {Nanoscale CeO2 (nanoceria) is a prototypical system that presents d0 ferromagnetism. Here, using a combination of x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and modeling, we show that the nanostructure, defects and disorder, and nonstoichiometry create magnetically polarized Ce 4f and O 2p hybridized states captured by the vacancy orbitals (Vorb) that are vital to ferromagnetism. Further, we demonstrate that foreign ions (Fe and Co) enhance the moment at Ce 4f sites while the number of Vorb is unchanged, pointing clearly to the mechanism of orbital hybridization being the key missing ingredient to understanding the unexpected ferromagnetism in many nanoscale dilute magnetic oxides and semiconductors.},
doi = {10.1103/PhysRevB.99.180403},
journal = {Physical Review B},
number = 18,
volume = 99,
place = {United States},
year = {2019},
month = {5}
}

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