DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 4: Multiferroics (joint session KFM/MA)

KFM 4.3: Vortrag

Montag, 16. März 2020, 15:40–16:00, HSZ 105

Investigation of multiferroic coupling in Ca3Mn1.9Ti0.1O7 by optical second harmonic generation — •Yannik Zemp1, Mads Weber1, Thomas Lottermoser1, Morgan Trassin1, Bin Gao2, Sang-Wook Cheong2, and Manfred Fiebig11Department of Materials, ETH Zurich — 2Rutgers University, New Jersey

Layered perovskite materials, such as A3B2O7 Ruddlesden-Popper compounds, are under scrutiny in the search for multiferroics with a strong magnetoelectric coupling and large polarisations at high temperatures. Their crystal structure allows for the implementation of a wide range of magnetic ions and it can be host to geometrically induced ferroelectricity. For Ca3Mn2O7, theory predicts a robust magnetoelectric coupling between the improper ferroelectricity and the Mn3+ magnetism, mediated by the MnO6-octahedra tilts. However, experimental evidence is still pending. Here, we investigate such a possible coupling in Ca3Mn1.9Ti0.1O7. We probe the influence of the magnetic ordering on the ferroelectricity using second harmonic generation (SHG) - a non-invasive, highly symmetry-sensitive laseroptical technique ideal for the study of ferroic order. We observe a strong increase in the SHG signal upon entering the magnetic phase, which indicates a strong influence of the magnetism on the ferroelectricity. Measurements of the SHG spectrum and images of the domain pattern suggest a coupling of the magnetic order to the polarisation mechanism via the octahedral tilts. Our results demonstrate that layered perovskites are promising candidates in search for multiferroics with pronounced magnetoelectric coupling.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2020 > Dresden