Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D68: Emergent phenomena in oxide interface due to broken symmetry and interface interactions
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 420
Sponsoring
Unit:
GMAG
Chair: Jian Liu, University of Tennessee
Abstract: D68.00004 : Emergent magnetic and topological phenomena in (111) pyrochlore iridate thin films
4:48 PM–5:24 PM
Presenter:
Xiaoran Liu
(Institute of Physics, Chinese Academy of Sciences)
Authors:
Xiaoran Liu
(Institute of Physics, Chinese Academy of Sciences)
Shiang Fang
(Rutgers University, New Brunswick)
Yixing Fu
(Rutgers University, New Brunswick)
Wenbo Ge
(Rutgers University)
Mikhail Kareev
(Rutgers University, New Brunswick)
Jong-Woo Kim
(Argonne National Laboratory)
Yongseong Choi
(Argonne National Laboratory)
Evguenia Karapetrova
(Argonne National Laboratory)
Qinghua Zhang
(Institute of Physics, Chinese Acadamy of Sciences)
Lin Gu
(Institute of Physics, Chinese Academy of Science)
Fangdi Wen
(Rutgers University)
Justin H Wilson
(Louisiana State University)
Gilberto Fabbris
(Argonne National Laboratory)
Philip J Ryan
(Argonne National Laboratory)
John W Freeland
(Argonne National Laboratory)
Daniel Haskel
(Argonne National Laboratory)
Weida Wu
(Rutgers University)
Jed Pixley
(Rutgers University)
Jak Chakhalian
(Rutgers University)
Collaborations:
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Science,
Beijing 10019, P. R. China, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA, National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA, Center for Computational Quantum Physics, Flatiron Institute, 162 5th Avenue, New York, New York 10010, USA, Physics Department, Princeton University, Princeton, New Jersey 08544, USA, Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Center for Computation & Technology, Louisiana State University, Baton Rouge, Louisiana 70803, USA
In this talk, we first report on a new synthesis protocol "in-situ solid phase epitaxy", where (111)-oriented high-quality single crystalline R2Ir2O7 thin films of millimeter-scale can be achieved. Next, we have done comprehensive exploration on the magnetic and topological properties of Eu2Ir2O7. Using synchrotron resonant X-ray magnetic scattering, we directly demonstrate the formation of the Ir "all-in-all-out" AFM order in R2Ir2O7 thin film, as required by the theoretical proposal. Concurrent with the magnetic transition, we reveal the emergence of an intrinsic anomalous Hall conductivity, which exhibits a colossal coercive field of ~100 T at low temperatures connected to the large spin-orbit interaction of Ir. These findings collectively single out the pyrochlore Eu2Ir2O7 as a rare example of AFM WSMs that was proposed a decade ago. In the end, we discuss the observations on distinctive behaviors between Eu2Ir2O7 and Y2Ir2O7, which indicate the emergence of an exotic chiral quantum disordered state in (111) Y2Ir2O7 thin films.
These results may have several broad implications for (i) exploiting the interplay of chiral edge excitations, spin-charge collective modes, topological Weyl magnons; (ii) investigating a new type of quantum criticality of the Luttinger liquid in R2Ir2O7; (iii) conceivably exploring an idea of quantum hydrodynamics in the ultra-clean limit. From the applied perspective, high-quality, well-characterized magnetic WSM films open a prospect to push the nascent field of topological AFM spintronics.
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