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| VOLUME 99 (2014) | ISSUE 3 | PAGE 185 |
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Coexistence of long range magnetic order and intervalent state of Eu in EuCu2(SixGe1-x)2: evidence from neutron diffraction and spectroscopic studies
P. A. Alekseeva,b, K. S. Nemkovskic, D. P. Kozlenkod, A. P. Menushenkovb, A. A. Yaroslavtsevb, A. V. Gribanove, E. S. Clementyeva,b,f, C. Pantaleig, B. Klobesh, R. P. Hermannh,i
aNational Research Centre "Kurchatov Institute", 123182 Moscow, Russia bNational Research Nuclear University "MEPhI", 115409 Moscow, Russia cJülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ, 85747 Garching, Germany dFrank Laboratory for Neutron Physics, Joint Institute for Nuclear Research, 191980 Dubna, Russia eChemistry Department of the MS University, 119991 Moscow, Russia fInstitute for Nuclear Research of the RAS, 142190 Troitsk, Russia gLaboratoire Léon Brillouin - UMR12 CNRS-CEA, CEA Saclay, 91191 Gif-sur-Yvette, France hJülich Centre for Neutron Science JCNS and Peter Grünberg Institute PGI, JARA-FIT, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany iFacultédes Sciences, Universitéde Liège, 4000 Liege, Belgium
Abstract
Experimental results of the X-ray absorption spectroscopy, Möβbauer spectroscopy (isomer shift) and neutron diffraction are presented for the series of EuCu2(SixGe1-x)2 polycrystalline samples (0<x<0.75). Homogeneous intermediate valence state is established for Eu-ions as well as long range magnetically ordered state at the temperatures below 10-15 K. Observation of the ordered magnetic moments at Eu site gives rise to the experimental statement for the coexistence of valence fluctuations and long range magnetic order takes place in the wide range of Ge concentrations for this substance. |