Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 64: Frustrated Magnets - α-RuCl₃ and Cu-based Materials

TT 64.9: Vortrag

Mittwoch, 14. März 2018, 17:15–17:30, HFT-FT 101

Neutron diffraction, muon spin rotation and Raman scattering investigation of the multiferroic antiferromagnetic quantum spin chain system CuCrO₄ — J. M. Law^1,5, V. Pomjakushin², G. Pascua², H. Luetkens², Th. Hansen³, R. Glaum⁴, A. Schulz¹, J. Wosnitza⁵, and •R. K. Kremer¹ — ¹Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany — ²Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland — ³Institut Laue Langevin, F-38042 Grenoble, France — ⁴Institut für Anorganische Chemie, Universität Bonn, Gerhard-Domagk-Strasse 1, D-53121 Bonn, Germany — ⁵Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany

Long-range magnetic ordering in multiferroic spin-chain compound CuCrO₄ was investigated by powder neutron diffraction and muon spin rotation measurements. Consistently, both methods find incommensurate long- range antiferromagnetic ordering below 9.0(3) K. The magnetic structure was determined from neutron powder diffraction patterns based on the propagation vector τ=(1,0,0.546(1)). The magnetic moment at 2K was refined to 0.67(10) µ_B. Low-temperature high-magnetic-field measurements of the magnetization and the dielectric polarization show the multiferroic phase to extend up to ≈ 23 T, after which a new, yet unknown phase appears. Full saturation of the magnetic moment is expected to occur at fields ≫ 60 T. Raman scattering and low-temperature x-raypowder diffraction measurements are used to correlate magnetic, structural and dielectric properties.