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Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Multiferroics II (jointly with DF, DS, KR, TT)

MA 21.9: Talk

Wednesday, April 2, 2014, 11:45–12:00, HSZ 04

The multiferroic CuCrO2 compound: interlayer exchange and domain population — •Matthias Frontzek — Laboratory for Neutron Scattering, Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland

Multiferroic materials have become of interest for their unusual low-temperature properties in general, and the tunability of the magnetic structure through an electric field and the electric polarization through a magnetic field in particular. The most promising candidates for such controllable multiferroics have been found among the materials with inherent geometric magnetic frustration.

Among these, the delafossite CuCrO2, which crystallizes in the rhombohedral R3m space group, is a multiferroic compound with an apparent strong coupling of spin and charge. In contrast to other multiferroic compounds CuCrO2 shows a spontaneous electric polarization upon antiferromagnetic ordering without an accompanying structural phase transition, thus the magnetic ordering alone breaks the inversion symmetry. The peculiar magnetic structure of CuCrO2 allows the direct quantitative analysis of the domain population.

In our contribution, we present a detailed study on CuCrO2 single crystals using neutron diffraction in applied electric and magnetic fields. With the fields we were able to tune the multiferroic states in CuCrO2 and could directly relate them to the underlying domain physics. Our results allow the re-interpretation of macroscopic measurements and show that the pd hybridization is the dominant spin-charge coupling mechanism.

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