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Report No.

Engineering a spin-orbital magnetic insulator by tailoring superlattices

Matsuno, Jobu*; Ihara, Kota*; Yamamura, Shugen*; Wadachi, Hiroki*; Ishii, Kenji; Shankar, V.*; Kee, H.-Y.*; Takagi, Hidenori*

In $$5d$$ Ir oxides with 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 $$infty$$). 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 $$m$$ $$simeq$$ 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.



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Category:Physics, Multidisciplinary



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