Universal effect of Mn-site doping on charge ordering in La1/3Ca2/3MnO3
| Autor: | J Y Laval, Ph. Monod, A.A. Greshnov, Jacques G. Noudem, T. S. Orlova |
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| Přispěvatelé: | Laboratoire d'Optique Physique (UPR0005) (LOP), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Phase transition
Materials science Manganite Analytical chemistry 02 engineering and technology Charge-ordering 01 natural sciences Ion [SPI.MAT]Engineering Sciences [physics]/Materials Charge ordering Condensed Matter::Materials Science [SPI]Engineering Sciences [physics] 0103 physical sciences Antiferromagnetism 010306 general physics [PHYS]Physics [physics] Condensed matter physics Dopant [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment Doping 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials Remanence [SDE]Environmental Sciences Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Insulator-metal transition |
| Zdroj: | Journal of Magnetism and Magnetic Materials Journal of Magnetism and Magnetic Materials, Elsevier, 2013, 342, pp.120-127. ⟨10.1016/j.jmmm.2013.04.061⟩ |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2013.04.061⟩ |
| Popis: | Comparison of doping effect on the charge ordering in La 1/3 Ca 2/3 Mn 1− y M y O 3 ( M : Fe, Ga, Cr, Ni, Cu, Ru, Mg and 0≤ y ≤0.07) has been investigated by combining magnetic and transport measurements and local compositional analysis in situ in transmission electron microscope. The effect of Mn-site doping on the charge ordering temperature T CO is shown for the first time to be universal for a given dopant valence and y ≤0.05. T CO is governed by the effective relative concentration n Mn3+ =Mn 3+ /(Mn 3+ +Mn 4+ ) of Mn 3+ ions, T CO ~ Cn Mn3+ , where the coefficient C depends on the valence but not on d -shell filling of a dopant ion. This dependence indicates that any of the considered dopants do not participate in charge transfer during charge ordering formation, however, indirectly affects the charge redistribution between manganese ions. Consideration of Mn-site doping effect on charge ordering temperature using a simple order–disorder model supports the concept of universality for a given dopant valence and dominating role of the factor of entropy over energy change. Analysis of the remanent magnetization together with the obtained behavior of T CO ( n Mn3+ ) testify that it is the dopant valence (Ru 5+ ), but not formation of Ru-based magnetic clusters, that is responsible for antiferromagnetic (AFM) insulator–ferromagnetic (FM) ‘bad-metal’ phase transition observed in the Ru-doped system at y =0.07. |
| Databáze: | OpenAIRE |
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