Magnetization reversal and negative volume thermal expansion in Fe doped Ca$_{2}$RuO$_{4}$

ORAL

Abstract

We report structural, magnetic, transport and thermal properties of single-crystal Ca$_{2}$Ru$_{1-x}$Fe$_{x}$O$_{4}$ (0 $\le $ x $\le $ 0.2) as functions of pressure, magnetic field and temperature. The central findings of this work are a pronounced magnetization reversal and a negative thermal expansion that are induced by Fe doping. Our results including neutron diffraction data suggest that the magnetization reversal is primarily a result of different temperature dependences of two antiparallel, competing Ru and Fe sublattices and that the negative thermal expansion is achieved via magnetic and metal-insulator transitions. We will present and discuss our results with comparison drawn with relevant systems.

*This work was supported by the NSF via Grant No. DMR-1265162

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Authors

  • T. F. Qi

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA

  • S. J. Yuan

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA

  • F. Ye

    • Quantum Conensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • S. Chi

    • Quantum Conensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • J. Terzic

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA

  • H. Zhang

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA

  • Z. Zhao

    • Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA

  • X. Liu

    • Institure of Physics, Chinese Academy of Sciences, Beijing, 100190, China

  • S. Parkin

    • Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA

  • W. L. Mao

    • Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA

  • G. Cao

    • Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA