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Multiferroic behavior in EuTiO3 films constrained by symmetry

Journal Article · · Physical Review B
 [1];  [2];  [2];  [3];  [2];  [2];  [4];  [5];  [6];  [7];  [7];  [8];  [2];  [2]
  1. Argonne National Laboratory (ANL), Argonne, IL (United States); Dublin City University (Ireland); University of Minnesota
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)
  3. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  4. Cornell University, Ithaca, NY (United States)
  5. Cornell University, Ithaca, NY (United States); Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY (United States)
  6. University of Minnesota, Minneapolis, MN (United States). Department of Chemical Engineering and Materials Science
  7. University of Liverpool (United Kingdom)
  8. Universidad de Castilla-La Mancha, Ciudad Real (Spain)
We have elucidated the spin, lattice, charge, and orbital coupling mechanism underlying the multiferroic character in tensile-strained EuTiO3 films. Symmetry determined by oxygen octahedral tilting shapes the hybridization between the Eu 4f and the Ti 3d orbitals, and this inhibits predicted Ti displacement proper ferroelectricity. Instead, phonon softening emerges at low temperatures within the pseudocube (110) plane, orthogonal to the anticipated ferroelectric polarization symmetry. Additionally, the magnetic anisotropy is determined by orbital distortion through hybridization between the Ti 3d and the typically isotropic Eu2+ 4f states. Here, this unique scenario demonstrates the critical role symmetry plays in the coupling of order parameters defining multiferroic behavior.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); University of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; AC02-98CH10886; SC0016371
OSTI ID:
1657858
Alternate ID(s):
OSTI ID: 1756928
OSTI ID: 1783933
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 101; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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