Magnetization reversal and metal-insulator transition in rare earth doped (Sr<sub>1-x</sub>Pr<sub>x</sub>)<sub>2</sub>IrO<sub>4</sub><sup>*</sup>

ORAL

Abstract

Sr2IrO4 is a spin-orbit-coupled insulator with an antiferromagnetic transition TN = 240 K. Due to delicate balance of energies that drive the unique ground state, chemical doping has strong effect on physical properties of iridates. We will discuss results of our recent study of Pr doped Sr2IrO4 and will compare those with our earlier work on Tb doping of the same compound. Substituting Pr3+ ion for the Sr2+ ion doesn’t alter the lattice parameters significantly, however even with slight Pr doping it induces several orders of magnitude reduction in resistivity as well as suppression of antiferromagnetic transition to lower temperatures. In addition to suppression of magnetic ordering temperature, field cooled magnetization reveals magnetization reversal below 30K which cannot be observed in zero-field cool magnetization. This behavior is quite different from that of Tb doped Sr2IrO4 and the comparison between the two systems will be discussed.

** This work was supported by the National Science Foundation via grant DMR-1712101.

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Presenters

  • Yu Zhang

    • Department of Physics, Univ of Colorado - Boulder
    • Department of Physics, University of Colorado

Authors

  • Yu Zhang

    • Department of Physics, Univ of Colorado - Boulder
    • Department of Physics, University of Colorado

  • Jasminka Terzic

    • Univ of Kentucky
    • National High Magnetic Field Laboratory
    • Department of Physics, Univ of Colorado - Boulder
    • University of Colorado at Boulder

  • Hengdi Zhao

    • Department of Physics, Univ of Colorado - Boulder
    • Department of Physics, University of Colorado
    • University of Colorado at Boulder

  • Hao Zheng

    • Department of Physics, Univ of Colorado - Boulder
    • Department of Physics, University of Colorado
    • University of Colorado at Boulder

  • Wenhai Song

    • Institute of Solid State Physics, Chinese Academy of Science
    • Department of Physics, Univ of Colorado - Boulder

  • Yifei Ni

    • Department of Physics, Univ of Colorado - Boulder
    • Department of Physics, University of Colorado

  • Gang Cao

    • Physics, Univ of Colorado - Boulder
    • Department of Physics, University of Colorado-Boulder
    • Department of Physics, University of Colorado Boulder
    • Materials Science and Engineering Program, University of Colorado Boulder
    • Department of Physics, Univ of Colorado - Boulder
    • Department of Physics, University of Colorado
    • University of Colorado at Boulder