Center for Artificial Low Dimensional Electronic Systems

“Intertwined structural and magnetic transitions in rare-earth nickelates ”

Dr. Alaska Subedi(CNRS, France)

April 11(Thu) - April 11(Thu), 2019

15:00

Seminar Room #201, Science building #3

Rare-earth nickelates RNiO3 exhibit a unique phase diagram where a metal-insulator transition is accompanied by structural and magnetic transitions.  It has experimentally been established that all rare-earth nickelates except LaNiO3 are metallic paramagnets with an orthorhombic structure at high temperatures.  At low temperature,the metal-insulator and an orthorhombic to monoclinic structural transitions occur simultaneously.  The transition temperature can be lowered by increasing the size of the rare-earth ion, and it approaches zero for LaNiO3.  I will present a theory to describe the structural, electronic and magnetic transitions in these materials and discuss how LaNiO3 differs from the rest of the members of the family.