Coexistence of Shubnikov–de Haas quantum oscillations and an antiferromagnetic insulating state in Ca3Ru2O7

ORAL

Abstract

The bilayered ruthenate Ca3Ru2O7 is known to be an antiferromagnetic (AFM) insulator with a charge gap of 0.1 eV. It undergoes a first-order metal-insulator transition at 48 K and an AFM transition at 56 K. Of a wide range of exotic phenomena of this system, the conflicting hallmarks of Shubnikov–de Haas (SdH)quantum oscillations and the AFM insulating state are the focus of our recent reinvestigation, which includes measurements of magnetic torque and magnetoresisticity at magnetic fields up to 36 Tesla at NHMFL. Our new results confirm strong SdH oscillations with low frequencies ranging from 20 Tesla to 120 Tesla. It is also remarkable that Ca3Ru2O7 features a pronounced resistivity saturation below 15 K, which, along with other phenomena, may signal a novel state existent in this oxide. All results will be presented and discussed along with comparison drawn with other relevant compounds.

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Presenters

  • Hao Zheng

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

Authors

  • Hao Zheng

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

  • Jasminka Terzic

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

  • David Graf

    NHMFL Tallahassee, NHMFL, National High Magnetic Field Lab, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory/Florida State University, Natl High Magnetic Field Lab, NHMFL at Florida State University, Florida State University, National High Magnetic Field Laboratory, Florida State University, Condensed Matter Science, NHMFL

  • 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

  • Yu Zhang

    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