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


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.

SUBMITTER: Hao L 

PROVIDER: S-EPMC6874576 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

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

Hao Lin L   Wang Zhentao Z   Yang Junyi J   Meyers D D   Sanchez Joshua J   Fabbris Gilberto G   Choi Yongseong Y   Kim Jong-Woo JW   Haskel Daniel D   Ryan Philip J PJ   Barros Kipton K   Chu Jiun-Haw JH   Dean M P M MPM   Batista Cristian D CD   Liu Jian J  

Nature communications 20191122 1


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 SrIrO<sub>3</sub>/SrTiO<  ...[more]

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