Doping-Induced Structural and Physical Properties Changes in Sr$_{3}$(Ru$_{1-x}$Mn$_{x})_{2}$O$_{7}$ Single Crystals

ORAL

Abstract

In the homologous strontium ruthenate series Sr$_{n+1}$Ru$_{n}$O$_{3n+1}$, double-layered Sr$_{3}$Ru$_{2}$O$_{7}$ exhibits unique physical properties. However, the partial substitution of Ru by the smaller Mn was found to change its ground state from a paramagnetic metal to an antiferromagnetic insulator with less distorted crystal structure. Interestingly, our Hall effect measurements show no change in the carrier concentration (x $\le $ 0.2), suggesting that Mn is isovalent with Ru in Sr$_{3}$(Ru$_{1-x}$Mn$_{x})_{2}$O$_{7}$. This is further supported by the magnetization data, which yield effective spin S = 3/2 for Mn corresponding to Mn$^{4+}$. In addition to bulk physical properties, the doping dependence of the surface structure and lattice dynamics of Sr$_{3}$(Ru$_{1-x}$Mn$_{x})_{2}$O$_{7}$ single crystals will be discussed.

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Authors

  • Biao Hu

    • Univ. of Tennessee, Knoxville, TN 37996

  • M. Angst

    • Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Oak Ridge TN 37831

  • Ovidiu Garlea

    • Neutron Scattering Science Division, ORNL, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge national laboratory
    • Oak Ridge National Laboratory

  • Von Braun Nascimento

    • Univ. of Tennessee, Knoxville, TN 37996
    • University of Tennessee

  • David Mandrus

    • Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Oak Ridge TN 37831
    • Oak Ridge Natl Lab

  • Ward Plummer

    • Univ. of Tennessee, Knoxville, TN 37996 and Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831
    • Oak Ridge National Lab, Oak Ridge, TN 37831 and Univ of Tennessee, Knoxville, TN 37996
    • University of Tennessee, Knoxville
    • University of Tennessee, Knoxville, TN 37996
    • University of Tennessee and ORNL
    • University of Tennessee

  • Ronying Jin

    • Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831 and Univ. of Tennessee, Knoxville, TN 37996
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory, Oak Ridge TN 37831
    • Oak Ridge National Laboratory