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TT: Fachverband Tiefe Temperaturen

TT 72: Correlated Electrons: Frustrated Magnets - General 2

TT 72.10: Vortrag

Donnerstag, 23. März 2017, 17:30–17:45, HSZ 204

Magnetic properties of Li₂FeSiO₄ single crystals — •Fabian Billert, Johannes Werner, Christoph Neef, Changhyun Koo, and Rüdiger Klingeler — Kirchhoff Institute of Physics, Heidelberg University, Heidelberg

Li₂FeSiO₄ single crystals of the high-temperature Pmnb-phase were grown by means of the travelling-solvent floating-zone technique. The single-crystal structure refinement reveals corner-sharing FeO₄ and SiO₄ tetrahedra in the ac-layers. Static magnetisation studies reveal long-range antiferromagnetic order below T_N=17 K. The maximum of the magnetic suceptibility appears at around 25 K indicating significant antiferromagnetic correlations well above T_N. This is corroborated by means of high-frequency electron spin resonance (HF-ESR) measurements which show temperature dependent resonances, i.e. the evolution of local magnetic fields, up to 100 K. Below T_N, antiferromagnetic resonance modes are detected and significant zero-field splitting is observed.