Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Spin Textures and magnetic Phase Transitions

MA 5.10: Vortrag

Montag, 7. März 2016, 12:30–12:45, H34

Zero-field µSR and HF-EPR study on complex magnetic order in layered trigonal MnSb₂O₆ — •Changhyun Koo¹, Rajib Sarkar², Michael Tzschoppe¹, Johannes Werner¹, Elena A. Zvereva³, Hans-Henning Klauss², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute of Physics, Heidelberg University, Germany — ²Institute for Solid State Physics, TU Dresden, Germany — ³Faculty of Physics, Moscow State University, Russia

A new phase of MnSb₂O₆ (P-31m) is studied by static and dynamic magnetic probes. SQUID data imply AFM order below T_N = 8.5 K and a spin-flop transition at B_SF ≤ 1 T. Antiferromagnetic resonance (AFMR) modes observed by means of high-frquency ESR confirm the AFM ground state and suggest a zero field splitting of 16.5 GHz. For B<B_SF , static magnetization data exhibit an anomaly at around 5.5 K which may be associated with the evolution of an incommensurate AFM phase predicted by theory [1]. Zero-field µSR measurements do not confirm the presence of weak ferromagnetism below 41 K [1]. At high temperatures, the µSR spectra follow a general exponential behavior which corresponds to fluctuations of electronic moments. Below T_N, µSR spectra show damped oscillation because of well-defined static internal fields at the muon site implying long range magnetic ordering. The magnetic order parameter is extracted and a clear λ-like anomaly in the relaxation rate is observed at T_N.
[1] V. B. Nalbandyan et al. Inorg. Chem. 54, 1705 (2015)