'工学部/工学系研究科 プレスリリース' blog (64135473799) of hub id 20511701

PRESS RELEASE

Engineering a Spin-Orbital Magnetic Insulator by Tailoring Superlattices

 

Authors

J. Matsuno, K. Ihara, S. Yamamura, H. Wadati, K. Ishii, V. V. Shankar, Hae-Young Kee, H. Takagi

 

Abstract

In  5 d  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.

 

20150618_matsuno.png https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.247209