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Title: Design of new Mott multiferroics via complete charge transfer: promising candidates for bulk photovoltaics

Abstract

Optimal materials to induce bulk photovoltaic effects should lack inversion symmetry and have an optical gap matching the energies of visible radiation. Ferroelectric perovskite oxides such as BaTiO 3 and PbTiO 3 exhibit substantial polarization and stability, but have the disadvantage of excessively large band gaps. We use both density functional theory and dynamical mean field theory calculations to design a new class of Mott multiferroics–double perovskite oxides A 2VFeO 6 (A = Ba, Pb, etc). While neither perovskite AVO 3 nor AFeO 3 is ferroelectric, in the double perovskite A 2VFeO 6 a ‘complete’ charge transfer from V to Fe leads to a non-bulk-like charge configuration–an empty V-d shell and a half-filled Fe-d shell, giving rise to a polarization comparable to that of ferroelectric ATiO 3. Different from nonmagnetic ATiO 3, the new double perovskite oxides have an antiferromagnetic ground state and around room temperatures, are paramagnetic Mott insulators. Most importantly, the V d 0 state significantly reduces the band gap of A 2VFeO 6, making it smaller than that of ATiO 3 and BiFeO 3 and rendering the new multiferroics a promising candidate to induce bulk photovoltaic effects.

Authors:
 [1];  [2]
  1. New York Univ. (NYU), Shanghai (China). NYU-ECNU Inst. of Physics; New York Univ. (NYU), NY (United States). Dept. of Physics
  2. Columbia Univ., New York, NY (United States). Dept. of Physics
Publication Date:
Research Org.:
New York Univ. (NYU), NY (United States); Columbia Univ., New York, NY (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF)
OSTI Identifier:
1490410
Grant/Contract Number:  
DMR-1120296; DMR-1308236
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; atomistic models; ferroelectrics and multiferroics; solar cells

Citation Formats

Chen, Hanghui, and Millis, Andrew. Design of new Mott multiferroics via complete charge transfer: promising candidates for bulk photovoltaics. United States: N. p., 2017. Web. doi:10.1038/s41598-017-06396-5.
Chen, Hanghui, & Millis, Andrew. Design of new Mott multiferroics via complete charge transfer: promising candidates for bulk photovoltaics. United States. doi:10.1038/s41598-017-06396-5.
Chen, Hanghui, and Millis, Andrew. Fri . "Design of new Mott multiferroics via complete charge transfer: promising candidates for bulk photovoltaics". United States. doi:10.1038/s41598-017-06396-5. https://www.osti.gov/servlets/purl/1490410.
@article{osti_1490410,
title = {Design of new Mott multiferroics via complete charge transfer: promising candidates for bulk photovoltaics},
author = {Chen, Hanghui and Millis, Andrew},
abstractNote = {Optimal materials to induce bulk photovoltaic effects should lack inversion symmetry and have an optical gap matching the energies of visible radiation. Ferroelectric perovskite oxides such as BaTiO3 and PbTiO3 exhibit substantial polarization and stability, but have the disadvantage of excessively large band gaps. We use both density functional theory and dynamical mean field theory calculations to design a new class of Mott multiferroics–double perovskite oxides A 2VFeO6 (A = Ba, Pb, etc). While neither perovskite AVO3 nor AFeO3 is ferroelectric, in the double perovskite A 2VFeO6 a ‘complete’ charge transfer from V to Fe leads to a non-bulk-like charge configuration–an empty V-d shell and a half-filled Fe-d shell, giving rise to a polarization comparable to that of ferroelectric ATiO3. Different from nonmagnetic ATiO3, the new double perovskite oxides have an antiferromagnetic ground state and around room temperatures, are paramagnetic Mott insulators. Most importantly, the V d 0 state significantly reduces the band gap of A 2VFeO6, making it smaller than that of ATiO3 and BiFeO3 and rendering the new multiferroics a promising candidate to induce bulk photovoltaic effects.},
doi = {10.1038/s41598-017-06396-5},
journal = {Scientific Reports},
number = ,
volume = 7,
place = {United States},
year = {2017},
month = {7}
}

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