Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.54: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Chiral fluctuations in Cu₂OSeO₃ and FeGe in their field modulated states: ^63,65Cu and ⁵⁷Fe NMR study — •Mayukh Majumder, Hiroshi Yasuoka, Panchanan Khuntia, Markus Schmidt, and Michael Baenitz — Max Plank Institute for Chemical Physics of Solids, Dresden, Germany

Insulating Cu₂OSeO₃ (ferrimagnetic transition temperature at 58 K) and metallic FeGe (ferromagnetic transition temperature at 280 K) show different field modulated states such as helical, conical along with topological Skyrmion phase [1,2,3]. We employed ^63,65Cu and ⁵⁷Fe NMR as a on site probe of field modulated states. The evolution of spectral shape from helical to conical to ferrimagnetic (for Cu₂OSeO₃) or ferromagnetic state (for FeGe) have been investigated. Further the spin-lattice relaxation rate (1/T₁) and spin-spin relaxation rate (1/T₂) provide the nature of chiral spin excitations across different field modulated phase boundaries.

[1] Science 336, 198(2012).

[2] Phys. Rev. Lett. 107, 127203(2011).

[3] Nature 8 153(2013).