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).

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