Anomalous magnetoresistance due to longitudinal spin fluctuations in a J_eff = 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 magnet

SUBMITTER: Hao L 

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

REPOSITORIES: biostudies-literature