Polar Antiferromagnets Produced with Orbital-Order

Abstract

Polar magnetic states are realized in pseudocubic manganite thin films fabricated on high-index substrates, in which a Jahn-Teller (JT) distortion remains an active variable. Several types of orbital-orders were found to develop large optical second harmonic generation, signaling broken-inversion-symmetry distinct from their bulk forms and films on (100) substrates. The observed symmetry-lifting and first-principles calculation both indicate that the modified JT q2 mode drives Mn-site off-centering upon orbital order, leading to the possible cooperation of "Mn-site polarization" and magnetism.

5 pages, 4 figures

References in corpus (7)

• Giant Flexoelectric Effect in Ferroelectric Epitaxial Thin Films
• Spin-polarization coupling in multiferroic transition-metal oxides
• Microwave imaging of mesoscopic percolating network in a manganite thin film
• Engineering multiferroism in CaMnO${}_3$
• Non-$d^0$ Mn-driven ferroelectricity in antiferromagnetic BaMnO${}_3$
• New Symmetries in Crystals and Handed Structures
• Induced magnetoelectric response in Pnma perovkites

Cited by in corpus (2)

• Orbital ordering induced ferroelectricity in SrCrO3
• Novel magneto-electric multiferroics from first-principles