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Structural and magnetic phase transitions in EuTi1xNbxO3

Ling Li, James R. Morris, Michael R. Koehler, Zhiling Dun, Haidong Zhou, Jiaqiang Yan, David Mandrus, and Veerle Keppens
Phys. Rev. B 92, 024109 – Published 30 July 2015

Abstract

We have investigated the structural and magnetic phase transitions in EuTi1xNbxO3 (0x0.3) with synchrotron powder x-ray diffraction, resonant ultrasound spectroscopy, and magnetization measurements. Upon Nb doping, the Pm3¯mI4/mcm structural transition shifts to higher temperatures and the room temperature lattice parameter increases while the magnitude of the octahedral tilting decreases. In addition, Nb substitution for Ti destabilizes the antiferromagnetic ground state of the parent compound and long-range ferromagnetic order is observed in the samples with x0.1. The structural transition in pure and doped compounds is marked by a dramatic steplike softening of the elastic moduli near TS, which resembles that of SrTiO3 and can be adequately modeled using the Landau free energy model employing the same coupling between strain and octahedral tilting order parameter as previously used to model SrTiO3.

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  • Received 20 May 2015

DOI:https://doi.org/10.1103/PhysRevB.92.024109

©2015 American Physical Society

Authors & Affiliations

Ling Li1, James R. Morris1,2, Michael R. Koehler1, Zhiling Dun3, Haidong Zhou3, Jiaqiang Yan1,2, David Mandrus1,2, and Veerle Keppens1

  • 1Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

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Issue

Vol. 92, Iss. 2 — 1 July 2015

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