Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.24: Poster

Thursday, March 10, 2016, 15:00–18:30, Poster D

Spin Dynamics in the Strongly Magnetically Frustrated Compounds YBaCo₃AlO₇ and YBaCo₃FeO₇ Probed by NMR and ESR Spectroscopy — •Margarita Iakovleva^1,2,4, Julian Zeisner^1,2, Martin Valldor³, Evgeniia Vavilova⁴, Hans-Joachim Grafe¹, Stephan Zimmermann^1,2, Alexey Alfonsov¹, Vladislav Kataev¹, and Bernd Büchner^1,2 — ¹IFW Dresden, Dresden, Germany — ²TU Dresden, Dresden, Germany — ³Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany — ⁴E. K. Zavoisky Physical-Technical Institute, Kazan, Russia

In the Swedenborgite type compounds YBaCo₃AlO₇ and YBaCo₃FeO₇ the magnetic lattice can be described as a stacking of kagome layers, where unconventional ground states such as a spin liquid state can be expected due to the strong geometrical frustration. We performed a combined experimental study of magnetic properties of single crystals of YBaCo₃AlO₇ and YBaCo₃FeO₇ with high field ESR and high field NMR spectroscopy. The experimental results show the occurrence of short-range quasi static electron spin correlations at T^* ≈ 22 K for YBaCo₃AlO₇ and T^* ≈ 60K for YBaCo₃FeO₇ but not a long-range antiferromagnetic order. We compare our results with AC and DC susceptibility measurements and discuss a possible competition between a spin glass-like state due to intrinsic structural disorder and a spin liquid state arising from strong magnetic frustration in this materials.