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

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, Cristian D. Batista and Jian Liu ()
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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
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
Jian Liu: University of Tennessee

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-13271-6

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