Phase segregation in the hole-doped manganite Nd0.93MnO2.96: magnetic measurements and neutron diffraction

Magnetic structure in the segregated phases Nd0.93MnO2.96

“…The complicated magnetic behaviour in Nd 0.93 MnO 2.96 was successfully explained by considering an AFM coupling between the FM components of two coexisting NdMnO 3 type phases. Magnetic and nuclear structure results were only briefly published in the Journal of Magnetic Materials and Magnetism [12] as a support of the interpretation of our magnetic measurements. The aim of this article is to present complete structural information.…”

“…Such microstructure reflects directly in a complicated behaviour of the magnetic measurement. Manganite with Nd rare-earth ion also appears to exhibit an interesting and complicated magnetic behaviour (with change of sign of the magnetization as a function of temperature) which can be interpreted by considering different microstructures [11][12][13][14]. First paper interpreting negative magnetization in NdMnO 3+ı as a phase segregation effect was published by Bartolomé et al [11] showing stray similarities with pioneer work of Chukalkin et al who showed that negative magnetization is also related to phase segregation affect in garnet samples [15].…”

“…Single phase model presents, roughly speaking, similar characteristic as NdMnO 3 model proposed in [16] (AFM main component of Mn sub-lattice plus Nd ordering at low temperature) with an additional Mn spin reorientation. Two phases models present in [26] have similar characteristic of model in [12] but with AFM and FM phases with a weak contribution of Nd at 60 K. In particular different magnetic models were compared in [26] which lead to almost the same fit of the data. -Further and major difficulties are found in studying vacancy doped R 1−x A x MnO 3 which are complex materials.…”

“…This is particularly important to make possible a clear evaluation of the proposed model which appears to lead to an attractive explanation of the original phenomenon found in the magnetic properties of R-A-Mn-O perovskites, as is the abrupt negative magnetization observed in the manganite Nd 0.93 MnO 2.96 [12].…”

“…In Ref. [12], we interpreted the particular magnetic behaviour in Nd 0.93 MnO 2.96 samples by considering two canted AFM phases with nuclear and magnetic structures closely related to the one of the NdMnO 3 [16]. Main characteristic of NdMnO 3 magnetic structure is a weak FM component superimposed to an A-type AFM component.…”