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 8.2: Vortrag
Dienstag, 13. März 2018, 09:45–10:00, EB 202
Structural and spectroscopic properties of the new multiferroic Ni2MnTeO6 — •Stella Skiadopoulou1,2, Maria Retuerto3, Fedir Borodavka1, Christelle Kadlec1, Filip Kadlec1, Zheng Deng3, Martha Greenblatt3, Dominik Legut2, and Stanislav Kamba1 — 1Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic — 2VSB Techincal University of Ostrava, Ostrava, Czech Republic — 3Rutgers, The State University of New Jersey, Piscataway, USA
We present structural, magnetic and spectroscopic studies of a new multiferroic Ni2MnTeO6, closely related to the polar antiferromagnet Ni3TeO6 known to
present a colossal magnetoelectric effect and electromagnons. Single crystals and polycrystalline samples show the same polar structure as Ni3TeO6 with
the R3 space group down to 4 K. An antiferromagnetic phase transition takes place at approximately TN=70 K, almost 20 K higher than that of Ni3TeO6. This was
confirmed by magnetic and dielectric measurements, suggesting the multiferroic character of the compound. Extensive infrared, Raman and THz spectroscopy experiments
revealed all phonons predicted by the factor group analysis. THz spectra reveal one new excitation below TN, which is strongly influenced by external magnetic field,
thus assigned to a magnon.
This work was supported by Czech Science Foundation grant No. 17-27790S and Path to Exascale project No. CZ.02.1.01/0.0/0.0/16_013/0001791.