Emergence of a Dynamic Super-Structural Order Integrating Antiferroelectric and Antiferrodistortive Competing Instabilities in EuTiO3
Jong-Woo Kim, Paul Thompson, Simon Brown, Peter S. Normile, John A., Schlueter, Andrey Shkabko, Anke Weidenkaff, Philip J. Ryan
TL;DR
This paper reveals a complex interplay of structural instabilities in EuTiO3, showing how antiferrodistortive and antiferroelectric orders coexist through a modulated structure, influencing magnetoelectric coupling.
Contribution
It uncovers a dynamic super-structural order in EuTiO3 that integrates competing antiferroelectric and antiferrodistortive instabilities via a modulated structure.
Findings
Coexistence of AFD and AFE orders in EuTiO3.
Electric and magnetic fields influence the modulated AFD order.
Magnetoelectric coupling arises from a dynamic equilibrium between magnetic and electric interactions.
Abstract
Microscopic structural instabilities of EuTiO3 single crystal were investigated by synchrotron x-ray diffraction. Antiferrodistortive (AFD) oxygen octahedral rotational order was observed alongside Ti derived antiferroelectric (AFE) distortions. The competition between the two instabilities is reconciled through a cooperatively modulated structure allowing both to coexist. The electric and magnetic field effect on the modulated AFD order shows that the origin of large magnetoelectric coupling is based upon the dynamic equilibrium between the AFD - antiferromagnetic interactions versus the electric polarization - ferromagnetic interactions.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.