Regensburg 2019 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 11: Multiferroics and Magnetoelectric coupling I (joint session MA/KFM)
KFM 11.2: Talk
Tuesday, April 2, 2019, 14:30–14:45, H37
Dielectric response of a vector-chiral magnetic ordering — •David Rivas Gongora1, Martina Dragičević1, Željko Rapljenović1, Mirta Herak1, Tomislav Ivek1, Matej Pregelj2, Andrej Zorko2, Helmuth Berger3, and Denis Arčon2 — 1Institute of Physics, Bijenička cesta 46, HR-10000 Zagreb, Croatia — 2Jožef Stefan Institute, Jamova c. 39, 1000 Ljubljana, Slovenia — 3Ecole polytechnique federale de Lausanne, CH-1015 Lausanne, Switzerland
β-TeVO4 is a zig-zag spin-1/2 quasi-one-dimensional system with a rich low-temperature phase diagram. Its vanadium spins interact through a nearest ferromagnetic (V-O-V) and next-nearest antiferromagnetic (V-O-Te-O-V) superexchange. The resulting frustration assisted by quantum fluctuations gives rise to three magnetic phase transitions [1]: paramagnetic to incommensurate spin density wave at TN1=4.65 K, followed by the so-called stripe phase under TN2=3.28 K, and lastly at TN3=2.28 K the system enters the vector-chiral ground state [2]. Interestingly, the complex magnetic landscape makes β-TeVO4 an ideal candidate for non-conventional magnetoelectric phases due to a symmetry which does not forbid the formation of electric dipoles [2,3]. We present the dynamic dielectric response of β-TeVO4 single crystal samples in the presence of a magnetic field and discuss it in the context of low-temperature magnetic ordering as a potentially multiferroic phase.
[1] Y. Savina et al. Phys. Rev. B 84, 104447 (2011). [2] M. Pregelj et al. Nature Communications 6 (2015), 10.1038/ncomms8255. [3] K. F. Wang et at. Adv. Phys 58, 321-448 (2009).