Influence of Ba substitution upon ferromagnetism in charge ordered Nd1−xCaxMnO3: singular behaviour of x = 0.43

Autor:	A. Maignan, M. Hervieu, B. Raveau, C. Yaicle, C. Martin, Vincent Hardy
Rok vydání:	2005
Předmět:	Condensed matter physics Ferromagnetism Zero field Atomic force microscopy Chemistry Substitution (logic) Condensed Matter::Strongly Correlated Electrons General Materials Science Charge (physics) Condensed Matter Physics Ground state Magnetic field
Zdroj:	Journal of Physics: Condensed Matter. 17:1019-1025
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/17/6/020
Popis:	The study of the substitution of Ba for Ca in the orbital-charge ordered manganites Nd1−xCaxMnO3, with , for low Ba levels (smaller than 6%) shows that, similarly to the Pr1−xCaxMnO3 system (Zhu et al 2004 J. Phys.: Condens. Matter 16 2861), a ferromagnetic ground state is obtained. The evolution of the ferromagnetic fraction in zero field is quite similar: it goes through a maximum at x = 0.43, which, for 4% Ba, is like for Pr a full ferromagnet at 2.5 K, with a ferromagnetic fraction of 90%. The higher Ba level necessary to reach the FM state in Nd phases compared to Pr is explained in terms of the antagonist effects of charge-orbital stability and local counter-distortion due to Ba. The different behaviour in a magnetic field, and especially the much larger magnetizations reached by Nd phases with respect to the Pr ones, , is explained in terms of Nd–Mn magnetic interactions, which destabilize the CE-type AFM structure.
Databáze:	OpenAIRE
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