Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session G64: Strong Correlation, Competing Phases, and Spin-Orbit Interactions in Complex Oxide Heterostructures
11:15 AM–2:15 PM,
Tuesday, March 3, 2020
Room: Mile High Ballroom 4E
Sponsoring
Unit:
DMP
Chair: Alexandru Bogdan Georgescu, Simons Foundation
Abstract: G64.00004 : Long-range magnetic reconstruction of Jeff = 1/2 pseudospins in Sr2IrO4 via 5d-4d interfacial interactions with Sr2RuO4
Presenter:
Maryam Souri
(University of Kentucky)
Authors:
Maryam Souri
(University of Kentucky)
Christopher Dietl
(Argonne National Laboratory)
Ekaterina Paerschke
(University of Alabama at Birmingham)
Gabriel A Calderon Ortiz
(The Ohio State University)
Sujan Shrestha
(University of Kentucky)
Jinwoo Hwang
(The Ohio State University)
Gang Cao
(University of Colorado at Boulder)
Jong Woo Kim
(Argonne National Laboratory)
Jung Ho Kim
(Argonne National Laboratory)
Ambrose Seo
(University of Kentucky)
We report the magnetic properties of Sr2IrO4 driven by 5d-4d interfacial interactions with Sr2RuO4. We have synthesized Sr2IrO4 thin films on Sr2RuO4 single crystal substrates by pulsed laser deposition. This heterostructure has never been studied before. We have observed the magnetic properties of this heterostructure are distinct from Sr2IrO4 thin-films under similar strain (-0.5 %) and Sr2IrO4 bulk crystals. Resonant inelastic x-ray scattering has revealed an anisotropic softening of magnetic excitations in the Sr2IrO4/Sr2RuO4, where the modified magnon dispersion indicates enhanced longer-range interactions between the Jeff = 1/2 pseudospins of Sr2IrO4. Note that this long-range magnetic reconstruction occurs throughout the entire Sr2IrO4. Our results imply the strong interfacial interactions between 5d iridates and 4d ruthenates. The approach of synthesizing epitaxial thin films on unconventional single crystal substrates opens a new direction of studying strongly correlated systems.
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