Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 79: Correlated Electrons - Poster Session
TT 79.36: Poster
Wednesday, April 2, 2014, 15:00–19:00, P2
Magnetic ground state and low-energy spin dynamics in single crystals of the frustrated magnet CoAl2O4 — •S. Zimmermann1,2, A. Alfonsov1, M. Iakovleva3, E. Vavilova3, H.-J. Grafe1, H. Luetkens4, O. Zaharko4, H.-H. Klauß2, A. Maljuk1, S. Wurmehl1, T. Dey1, V. Kataev1, and B. Büchner1,2 — 1IFW Dresden, Germany — 2TU Dresden, Germany — 3Zavoisky Phys.-Tech. Inst., RAS, Kazan, Russia — 4PSI Villigen, Switzerland
Frustrated magnetic systems are of special interest because they can exhibit exotic magnetic ground states like spin ice or spin liquid. The compound CoAl2O4 belongs to the A-site spinels, where the Co ions form a diamond lattice and the frustration originates from competing nearest- and next-nearest neighbor interactions. Thus the frustration tends to suppress long-range magnetic ordering and favors short-range spin correlations. This effect can be supported by disorder, e.g., site inversion. Due to the recent breakthrough in the growth of high-quality single crystals [1], it has become possible to study the magnetic ground state of CoAl2O4 in detail. Recent neutron scattering results give strong indications that a spin liquid like magnetic ground state is realized in such CoAl2O4 single crystals [2]. To further clarify this question, we have studied these crystals with high field high frequency ESR, NMR and µ-SR techniques. The experimental results have enabled to obtain important insights into the properties of the ground state, spin dynamics and magnetic interactions in this compound which will be discussed in this presentation.
A. Maljuk et al., J. Cryst. Growth 311, 3997 (2009)
O.Zaharko et al., Phys. Rev. B 84, 094403 (2011)