Anomalous magnetoresistance due to longitudinal spin fluctuations in a <i>J</i><sub>eff</sub> = 1/2 Mott semiconductor

ORAL

Abstract

While manipulation of antiferromagnetic (AFM) order arises to the forefront of spintronics, fluctuation of AFM order is a long-standing problem lying at the heart of correlated electron physics. By engaging with staggered magnetic field effect (STMF), the AFM fluctuation can be manifested as a set of emerging quantum phenomena [Nat. Phys. 14, 806 (2018)]. Here we will present the observation of a positive magnetoresistance that probes the staggered susceptibility of a Jeff = 1/2 Mott semiconductor, which is built as a strong spin-orbit coupled SrIrO3/SrTiO3 superlattice [Phys. Rev. Lett. 119, 027204 (2017)]. This magnetoresistance is particularly large in the insulating paramagnetic phase near the Néel transition. We illustrate its origin of a collective charge response to the large longitudinal spin fluctuations due to the STMF. This result demonstrates a magnetic control of the binding energy of the fluctuating particle-hole pairs in the Slater-Mott crossover regime [Nat. Commun. 10, 5301 (2019)].

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Presenters

  • Lin Hao

    • University of Tennessee

Authors

  • Lin Hao

    • University of Tennessee

  • Zhentao Wang

    • School of Physics and Astronomy, University of Minnesota
    • University of Minnesota
    • University of Tennessee

  • Junyi Yang

    • University of Tennessee

  • Derek J Meyers

    • Brookhaven National Laboratory

  • Jiun-Haw Chu

    • University of Washington
    • Department of Physics, University of Washington, Seattle
    • Department of Physics, University of Washington
    • Physics, University of Washington

  • Mark Dean

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory

  • Cristian Batista

    • University of Tennessee
    • Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA
    • Department of Physics and Astronomy, University of Tennessee
    • Physics and Astronomy, University of Tennessee
    • Oakridge National Laboratory
    • Department of Physics and astronomy, University of Tennessee
    • University of Tennessee, Knoxville
    • Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Jian Liu

    • University of Tennessee
    • University of Tennessee, Knoxville