Nd crystal-field study of weakly doped Nd1−xCaxMnO3 |
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| Authors: | S. Jandl A.A. Mukhin V. Yu Ivanov A. Balbashov M. Orlita |
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| Affiliation: | aUniversité de Sherbrooke, Département de Physique, 2500 Boulevard de l’Université, Sherbrooke, Quebec, Canada J1K 2R1;bGeneral Physics Institute of the Russian Academy of Sciences, 38 Vavilov St., 119991 Moscow, Russia;cMoscow Power Engineering Institute, 14 Krasnokazarmennaya St., 105835 Moscow, Russia;dGrenoble High Magnetic Field Laboratory, 25, Avenue des Martyrs, Boîte Postale 166, F-38042 Grenoble, France |
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| Abstract: | Nd3+ crystal-field excitations in Nd1−xCaxMnO3 (x=0.025, 0.05 and 0.1) single crystals are studied via infrared transmission as a function of temperature and external magnetic field. We report excitations associated with Nd3+ sites as detected in NdMnO3 and excitations due to Ca doping. The latter reveal phase separation between the usual A-type antiferromagnetic states and the insulating canted (ferromagnetic) spin states in the vicinity of doped Ca2+ ions. Both Nd3+ crystal-field levels could be described using calculated parameters for NdMnO3. Also, while oxygen stoichiometry and coherent Jahn–Teller distortions seem not to be affected by Ca doping, increased absorption bandwidths characterize the doped crystals. |
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| Keywords: | Infrared transmission Crystal-field Doped manganites |
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