Abstract
Polycrystalline samples of ytterbium manganites have been synthesized with deficiency of Yb3+ ions. The X-ray analysis showed that the structure of the sample is hexagonal (h-YbMnO3) with the space group P63cm. The analysis of the X-ray diffraction peak intensities allowed to find the occupancy of Yb3+ and Mn3+ positions which are about 89 and 100 %, respectively. The electron spin resonance (ESR) measurements were performed using X (9.4 GHz), Q (34.2 GHz) and W (94.1 GHz) bands. The ESR spectrum displays the broad exchange-narrowed Mn3+ resonance line and an additional signal, which is attributed to the ferromagnetically correlated clusters, formed by mixed-valence manganese ions near vacant Yb3+ positions, confirmed by the observation of the hysteresis loop in the magnetization of h-YbMnO3.
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Acknowledgments
This work was supported by the program of the Presidium of the Russian Academy of Sciences (No. 26 “Electron spin resonance, spin-dependent electronic effects and spin technologies”). We are grateful to the Institute of Geology and Petroleum Technologies of the Kazan (Volga region) Federal University for the study by the X-ray fluorescence analysis. The authors are also grateful to the Ministry of Education and Science of the Russian Federation for the financial support and to the Federal Center for Collective Use of the Kazan Federal (Volga region) University and Ildar F. Gilmutdinov for the measurements of the field and temperature dependences of the magnetization.
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Eremina, R.M., Gavrilova, T.P., Yatsyk, I.V. et al. Magnetic Resonance Investigations of h-YbMnO3 . Appl Magn Reson 47, 869–879 (2016). https://doi.org/10.1007/s00723-016-0798-0
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DOI: https://doi.org/10.1007/s00723-016-0798-0