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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