Comprehensive Electrical Control of Metamagnetic Transition of a Quasi‐2D Antiferromagnet by In Situ Anisotropic Strain
Abstract
Effective nonmagnetic control of the spin structure is at the forefront of the study for functional quantum materials. This study demonstrates that, by applying an anisotropic strain up to only 0.05%, the metamagnetic transition field of spin–orbit‐coupled Mott insulator Sr2IrO4 can be in situ modulated by almost 300%. Simultaneous measurements of resonant X‐ray scattering and transport reveal that this drastic response originates from the complete strain‐tuning of the transition between the spin‐flop and spin‐flip limits, and is always accompanied by large elastoconductance and magnetoconductance. This enables electrically controllable and electronically detectable metamagnetic switching, despite the antiferromagnetic insulating state. The obtained strain‐magnetic field phase diagram reveals that C4‐symmetry‐breaking anisotropy is introduced by strain via pseudospin‐lattice coupling, directly demonstrating the pseudo‐Jahn–Teller effect of spin–orbit‐coupled complex oxides. The extracted coupling strength is much weaker than the superexchange interactions, yet crucial for the spontaneous symmetry‐breaking, affording the remarkably efficient strain‐control.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 22, 2020
- Source ID
- 10.1002/adma.202002451
Entities
People
- Andrew F May
- Han Zhang
- Jian Liu
- Jiun‐haw Chu
- Jong‐woo Kim
- Josh Mutch
- Junyi Yang
- Kyle Noordhoek
- Lin Hao
- Philip J. Ryan
- Qing Huang
- Zhaoyu Liu
Organizations
- Air Force Office of Scientific Research
- Argonne National Laboratory
- David and Lucile Packard Foundation
- Dublin City University
- Oak Ridge National Laboratory
- Office of Basic Energy Sciences
- Office of Science
- United States Department of Energy
- University of Tennessee
- University of Washington