Dresden 2017 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 9: Poster Session

DF 9.28: Poster

Tuesday, March 21, 2017, 14:00–16:00, P1C

Dielectric properties of the spin driven multiferroics linarite and LiCuVO₄ — •Alexander Ruff, Theresa Mack, Stephan Krohns, Peter Lunkenheimer, and Alois Loidl — Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, Germany

In the last decade, various mechanisms for coupled polar and magnetic ordering, so called multiferroicity, were discovered. Among various multiferroic systems, spin-driven ferroelectrics are especially in the scientific focus due to a close coupling of spin and charge leading to cross-link control of magnetic and electric order. These systems have noncollinear spin structures, e.g., magnetic phases with spiral or helical order. Thus, two canted neighbouring spins S_i and S_j allow for inverse Dzychaloshinskii-Moriya interaction resulting in spin-driven ferroelectric polarization P via P ∝ Q x (S_i x S_j), where Q denotes the propagation vector of the spin spiral. Those complex magnetic phases are often based on unconventional magnetic behaviour, which can be found in frustrated quantum spin systems, like LiCuVO₄ or the naturaly grown single crystal linarite, PbCuSO₄(OH)₂.
Here we present the dielectric properties as well as the ferroelectric polarization from pyro- and magnetocurrent measurements, both in external magnetic fields up to 12 T. Finally, we provide (H,T)-diagrams for the multiferroic phase of linarite and the new high-temperature phase of LiCuVO₄.