Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 8: Multiferroics and magnetoelectrics I (joint session MA/KFM)
KFM 8.10: Vortrag
Dienstag, 13. März 2018, 12:00–12:15, EB 202
Directional dichroism via para-magnetoelectric effect in Sr2CoSi2O7 — •Dániel G. Farkas1, Dávid Szaller1, Vilmos Kocsis1,2, Sándor Bordács1, István Kézsmárki1, Bence Bernáth3, Dmytro Kamenskyi3, Laur Peedu4, Johan Viirok4, Toomas Rõõm4, Urmas Nagel4, Péter Balla5, and Karlo Penc5 — 1BUTE, Hungary — 2RIKEN CEMS, Japan — 3HFML, Netherlands — 4KBFI, Estonia — 5WRCP, Hungary
Magnetoelectric multiferroics have been attracting enormous interest due to their potential in information technology applications. An exotic phenomenon, directional dichroism (DD) has been reported for spin excitations in multiferroic melilite single crystals and proposed as a new principle of directional light switches operating in the THz region [1].
Applications of multiferroic compounds seem to be limited to low temperatures where electric and magnetic order coexist. However, recent studies on melilites [2] revealed that an external magnetic field can recover the electric polarization via the para-magnetoelectric effect even above TN = 7 K. Based on these static results we can also expect DD to emerge in the paramagnetic phase of melilites.
Indeed we have found strong DD in the paramagnetic phase of Sr2CoSi2O7 in high magnetic field. A simple single-ion model was developed, which described the main features of the high temperature directional dichroism.
[1] I. Kézsmárki, D. Szaller et al. Nat. Commun. 5, 3203 (2013).
[2] M. Akaki et al., Phys. Rev. B 86, 060413(R) (2012).