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Anomalous magnetoresistance due to longitudinal spin fluctuations in a Jeff = 1/2 Mott semiconductor

Author

Listed:
  • Lin Hao

    (University of Tennessee)

  • Zhentao Wang

    (University of Tennessee)

  • Junyi Yang

    (University of Tennessee)

  • D. Meyers

    (Brookhaven National Laboratory)

  • Joshua Sanchez

    (University of Washington, Seattle)

  • Gilberto Fabbris

    (Advanced Photon Source, Argonne National Laboratory)

  • Yongseong Choi

    (Advanced Photon Source, Argonne National Laboratory)

  • Jong-Woo Kim

    (Advanced Photon Source, Argonne National Laboratory)

  • Daniel Haskel

    (Advanced Photon Source, Argonne National Laboratory)

  • Philip J. Ryan

    (Advanced Photon Source, Argonne National Laboratory
    Dublin City University)

  • Kipton Barros

    (Theoretical Division and CNLS, Los Alamos National Laboratory)

  • Jiun-Haw Chu

    (University of Washington, Seattle)

  • M. P. M. Dean

    (Brookhaven National Laboratory)

  • Cristian D. Batista

    (University of Tennessee
    Quantum Condensed Matter Division and Shull-Wollan Center, Oak Ridge National Laboratory)

  • Jian Liu

    (University of Tennessee)

Abstract

As a hallmark of electronic correlation, spin-charge interplay underlies many emergent phenomena in doped Mott insulators, such as high-temperature superconductivity, whereas the half-filled parent state is usually electronically frozen with an antiferromagnetic order that resists external control. We report on the observation of a positive magnetoresistance that probes the staggered susceptibility of a pseudospin-half square-lattice Mott insulator built as an artificial SrIrO3/SrTiO3 superlattice. Its size is particularly large in the high-temperature insulating paramagnetic phase near the Néel transition. This magnetoresistance originates from a collective charge response to the large longitudinal spin fluctuations under a linear coupling between the external magnetic field and the staggered magnetization enabled by strong spin-orbit interaction. Our results demonstrate a magnetic control of the binding energy of the fluctuating particle-hole pairs in the Slater-Mott crossover regime analogous to the Bardeen-Cooper-Schrieffer-to-Bose-Einstein condensation crossover of ultracold-superfluids.

Suggested Citation

  • Lin Hao & Zhentao Wang & Junyi Yang & D. Meyers & Joshua Sanchez & Gilberto Fabbris & Yongseong Choi & Jong-Woo Kim & Daniel Haskel & Philip J. Ryan & Kipton Barros & Jiun-Haw Chu & M. P. M. Dean & Cr, 2019. "Anomalous magnetoresistance due to longitudinal spin fluctuations in a Jeff = 1/2 Mott semiconductor," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13271-6
    DOI: 10.1038/s41467-019-13271-6
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    Cited by:

    1. Paul Foulquier & Marcello Civelli & Marcelo Rozenberg & Alberto Camjayi & Joel Bobadilla & Dorothée Colson & Anne Forget & Pierre Thuéry & François Bertran & Patrick Le Fèvre & Véronique Brouet, 2023. "Evolution of the spectral lineshape at the magnetic transition in Sr $$_2$$ 2 IrO $$_4$$ 4 and Sr $$_3$$ 3 Ir $$_2$$ 2 O $$_7$$ 7," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 96(4), pages 1-12, April.

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