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Electrical Control of Structural and Physical Properties via Strong Spin-Orbit Interactions in Sr2IrO4
Cao, G Terzic, J Zhao, HD Zheng, H De Long, LE Riseborough, PS
Cao, G
Terzic, J
Zhao, HD
Zheng, H
De Long, LE
Riseborough, PS
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2018-01-04
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10.1103/PhysRevLett.120.017201
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© 2018 American Physical Society. Electrical control of structural and physical properties is a long-sought, but elusive goal of contemporary science and technology. We demonstrate that a combination of strong spin-orbit interactions (SOI) and a canted antiferromagnetic Mott state is sufficient to attain that goal. The antiferromagnetic insulator Sr2IrO4 provides a model system in which strong SOI lock canted Ir magnetic moments to IrO6 octahedra, causing them to rigidly rotate together. A novel coupling between an applied electrical current and the canting angle reduces the Néel temperature and drives a large, nonlinear lattice expansion that closely tracks the magnetization, increases the electron mobility, and precipitates a unique resistive switching effect. Our observations open new avenues for understanding fundamental physics driven by strong SOI in condensed matter, and provide a new paradigm for functional materials and devices.
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Physical Review Letters
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