Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: Frustrated Magnets - Chiral Magnets & RuCl₃

TT 34.6: Vortrag

Dienstag, 8. März 2016, 15:15–15:30, H20

High-frequency ESR studies and the magnetic phase diagram of chiral-structured MnSb₂O₆ — •Johannes Werner¹, Changhyun Koo¹, Elena Zvereva², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, Heidelberg University, Heidelberg, Germany — ²Faculty of Physics, Moscow State University, Moscow, Russia

Magnetic properties of the chiral-structured magnet MnSb₂O₆ (P321 phase) were investigated by means of static magnetization and high-frequency electron-spin-resonance (HF-ESR) studies. The ground state has been reported to exhibit incommensurate order based on corotating cycloids [1]. Our studies confirm T_N = 11.5 K but imply at least three different AFM phases appearing in the magnetic phase diagram. HF-ESR spectra of the MnSb₂O₆ powder sample at frequencies of f ∼ 260 GHz and f ∼ 38 GHz show a single resonance feature at high temperatures, respectively, which significantly broadens upon cooling. In addition, the resonance shifts to lower fields when temperature is approaching T_N, signaling the evolution of local fields. At low-temperatures, the magnetic field vs. frequency diagram exhibits two resonance branches which are associated with the antiferromagnetic resonance (AFMR) modes. The AFMR branches are linear in the range of 70 GHz to 320 GHz but the low field resonance branch shows an upturn indicating a zero-field splitting of ZFS = 22 GHz. The data are analyzed in terms of an AFMR mean field model with six sublattices.
R. D. Johnson, K. Cao, L. C. Chapon, F. Fabrizi, N. Perks,

P. Manuel, J. J. Yang, Y. S. Oh, S.-W. Cheong, P. G. Radaelli,

PRL 111, 017202 (2013).