Orientation of Nd and Mn magnetic moments in a CMR Nd0.72Ba0.28MnO3 by X-ray magnetic circular dichroism |
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| Authors: | O Toulemonde F Studer A Llobet L Ranno A Maignan E Pollert M Nevriva E Pellegrin NB Brooks J Goedkoop |
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| Institution: | aCRISMAT, ISMRA, Boulevard Maréchal Juin, 14050 Caen Cedex, France;bLaboratoire de Magnétisme Louis Néel, CNRS-BP 166, F-38042 Grenoble Cedex 09, France;cLaboratory of Oxidic Materials, Institute of Physics, 162 53 Prague 6, Czech Republic;dForschungszentrum Karlsruhe, ANKA P.O. Box 3640, D-76021 Karlsruhe, Germany;eESRF, BP 220, 38043 Grenoble Cedex, France |
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| Abstract: | X-ray absorption and X-ray magnetic circular dichroism at Mn L2,3- and Nd M4,5-edges of a twinned Nd0.72Ba0.28MnO3 single crystal have been performed versus temperature (between 10 and 300 K) and applied magnetic field (between 0 and 6.5 T). The results show that neodymium cations order below 70 K with the magnetic moments antiparallel to the manganese subnetwork in weak applied magnetic field (<1.5 T). For higher magnetic field, the neodymium moments turn parallel to the manganese ones showing that the antiferromagnetic exchange coupling between both subnetworks is weak. The presence of a metal–insulator transition below 70 K in the studied single crystal correlated to the magnetic ordering of neodymium cations can be understood on the basis of the cation mismatch introduced by barium substitution. |
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| Keywords: | X-ray absorption and absorption edges Giant magnetoresistances |
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