title: Engineering a Spin-Orbital Magnetic Insulator by Tailoring Superlattices.
abstract: In 5d Ir oxides with an interplay of spin-orbit coupling and electron correlations, we have tailored a spin-orbital magnetic insulator out of a semimetal SrIrO(3) by tuning the structure through superlattices [(SrIrO(3))(m), SrTiO(3)] (m=1,2,3,4, and ∞). We observed the systematic decrease of the magnetic ordering temperature and the resistivity as a function of m. The transition from the semimetal to the insulator is found to be closely linked to the appearance of magnetism at m≃3. Long range magnetic ordering was realized even in the m=1 single layer superlattice, implying that the design and realization of novel electronic phases is feasible at the level of a single atomic layer in complex Ir oxides.
authors.affiliation: RIKEN Advanced Science Institute, Wako, Saitama 351-0198, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Matsuno
authors.affiliation: Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ihara
authors.affiliation: Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yamamura
authors.affiliation: Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan.|Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Wadati
authors.affiliation: SPring-8, Japan Atomic Energy Agency, Sayo, Hyogo 679-5148, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ishii
authors.affiliation: Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada.
authors.forename: V V
authors.initials: VV
authors.lastname: Shankar
authors.affiliation: Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada.|Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada.
authors.forename: Hae-Young
authors.initials: HY
authors.lastname: Kee
authors.affiliation: RIKEN Advanced Science Institute, Wako, Saitama 351-0198, Japan.|Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Takagi