Elastic, structural and magnetic properties of EuTi$_{\mathrm{1-x}}$A$_{\mathrm{x}}$O$_{3}$ (A$=$Zr, Nb)

ORAL

Abstract

The elastic moduli as a function of temperature (280-380 K) and magnetic field (0-9T) for single crystal EuTiO$_{3}$ have been measured using resonant ultrasound spectroscopy (RUS). All the moduli show a sharp step-like softening upon the cubic-to-tetragonal transition at around 288K. We also present low-temperature XRD, magnetic susceptibility, and RUS results on polycrystalline EuTi$_{\mathrm{1-x}}$Zr$_{\mathrm{x}}$O$_{3}$ and EuTi$_{\mathrm{1-x}}$Nb$_{\mathrm{x}}$O$_{3}$ (x$=$0.015, 0.03 and 0.05). All of the compositions investigated present a cubic-to-tetragonal structural transition as temperature is lowered. Our results indicate that the transition temperature of the structural instability increases to higher temperatures with increasing Zr and Nb concentration in both solid-solutions, accompanied by the decrease of the antiferromagnetic transition temperature T$_{\mathrm{N}}$. While the structural distortion in EuTi$_{\mathrm{1-x}}$Zr$_{\mathrm{x}}$O$_{3}$ is suppressed with increasing Zr doping, the magnitude of the structural distortion in EuTi$_{\mathrm{1-x}}$Nb$_{\mathrm{x}}$O$_{3}$ is not affected by Nb-doping. The differences between Zr and Nb as dopants are discussed.

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Authors

  • Ling Li

    University of Tennessee

  • Z.L Dun

    University of Tennessee, University of Tennessee, Knoxville, University of Tennessee, TN, USA

  • Jiaqiang Yan

    University of Tennessee and Oak Ridge National Laboratory

  • H.D. Zhou

    University of Tennessee and National High Magnetic Field Laboratory, Florida State University, University of Tennessee - Knoxville, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee, 37996, Department of Physics and Astronomy, University of Tennessee, University of Tennessee, Department of Physics and Astronomy, University of Tennessee - Knoxville, University of Tennessee, TN, USA

  • David Mandrus

    Oak Ridge Natl Lab, Department of Materials Science and Engineering, the University of Tennessee, Knoxville, TN 37996, USA, Oak Ridge National Lab, Univ of Tennessee, University of Tennessee and Oak Ridge National Laboratory, Univ of Tennessee Knoxville, University of Tennessee, Oak Ridge National Laboratory

  • Veerle Keppens

    University of Tennessee