Tuning order-by-disorder multiferroicity in CuO by doping

Abstract

The high Curie temperature multiferroic compound, CuO, has a quasidegenerate magnetic ground state that makes it prone to manipulation by the so called ``order-by-disorder'' mechanism. First principle computations supplemented with Monte Carlo simulations and experiments show that isovalent doping allows to stabilize the multiferroic phase in non-ferroelectric regions of the pristine material phase-diagram with experiments reaching a 250% widening of the ferroelectric temperature window with 5% of Zn doping. Our results allow to validate the importance of a quasidegenerate ground state on promoting multiferroicity on CuO at high temperatures and open a path to the material engineering of new multiferroic materials.

10 pages, 7 figures

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• Spin dynamics and exchange interactions in CuO measured by neutron scattering
• Optical control of competing exchange interactions and coherent spin-charge coupling in two-orbital Mott insulators
• Ultrafast cooling and heating scenarios for the laser induced phase transition in CuO
• Low temperature magnetism of KAgF3
• Atomic-scale 3D imaging of individual dopant atoms in a complex oxide
• Automated computational workflows for muon spin spectroscopy
• Tracking a hysteretic and disorder-broadened phase transition via the electromagnon response in improper ferroelectrics