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

Author:

Hao LinORCID,Wang ZhentaoORCID,Yang Junyi,Meyers D.,Sanchez Joshua,Fabbris GilbertoORCID,Choi YongseongORCID,Kim Jong-Woo,Haskel Daniel,Ryan Philip J.,Barros Kipton,Chu Jiun-Haw,Dean M. P. M.,Batista Cristian D.ORCID,Liu JianORCID

Abstract

AbstractAs 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.

Funder

United States Department of Defense | Defense Advanced Research Projects Agency

Start-up fund and the Science Alliance Joint Directed Research & Development Program at the University of Tennessee; Organized Research Unit Program at the University of Tennessee.

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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