Abstract
The study of the substitution of Ba for Ca in the orbital-charge ordered manganitesNd1−xCaxMnO3, with , for low Ba levels (smaller than 6%) shows that, similarly to thePr1−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 maximumat x = 0.43, which, for 4% Ba, is like for Pr a full ferromagnet at 2.5 K, with a ferromagnetic fractionof 90%. The higher Ba level necessary to reach the FM state in Nd phases compared to Pris explained in terms of the antagonist effects of charge-orbital stability and localcounter-distortion due to Ba. The different behaviour in a magnetic field, and especially themuch 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-typeAFM structure.
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