Magnetic properties of the multiferroic compounds Eu1-xYxMnO3 (x = 0.2 and 0.3)

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Kalvius, G.M.^1 ; Litterst, F.J.^2 ; Hartmann, O.^3 ; Wäppling, R.^3 ; Krimmel, A.^4 ; Mukhin, A.A.^5 ; Balbashov, A.M.^6 ; Loidl, A.^4

Physics Department, Technical University Munich, Garching

85747, Germany^1

IPCM, Technical University Braunschweig, Braunschweig

38106, Germany^2

Department of Physics and Astronomy, Uppsala University, Uppsala

75120, Sweden^3

Experimental Physics v, University of Augsburg, Augsburg

86159, Germany^4

General Physics Institute, Russian Academy of Sciences, Moscow

119991, Russia^5

Moscow Power Engineering Institute, Moscow

105835, Russia^6

关键词: Collinear spin structures;    Incommensurate modulation;    Magnetic ground state;    Magnetic phase diagrams;    Magnetic transitions;    Spiral spin structure;    Ssbauer spectroscopies;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012014/pdf
DOI  :  10.1088/1742-6596/551/1/012014

来源: IOP

【 摘 要 】

Magnetic properties of multiferroic Eu1-xYxMnO3 with x 0.2, 0.3 were studied by μSR and Mossbauer spectroscopy. Both compounds are known to become antiferromagnetic with Mn3+being the only magnetic ion. We find TN 47±0.5K for x 0.2 and 45±0.5K for x 0.3. Below TN three different magnetic states (AFM-1, AFM-2, AFM-3) are formed. The μSR parameters of the uppermost magnetic state (AFM-1) are alike in both compounds, and compatible with a commensurate modulated collinear spin structure. The magnetic ground state in x 0.2 (AFM-3) is shown to be single phase. Its spectral parameters support the proposal of a cone-like spin structure, yet with incommensurate modulation. The ground state for x 0.3 is found to have an incommensurate spiral spin structure.151Eu Mössbauer spectroscopy measured the Eu hyperfine field induced by the Mn3+ ions. Its low value (∼4T) means that mixing with higher Eu electronic states is small and that the Mn-Eu exchange coupling is weak (∼0.5K). The various magnetic transitions appear as small irregularities in the temperature dependence of the hyperfine fields. The present results are discussed in terms of different published magnetic phase diagrams of Eu1-xYxMnO3.