Effects on phase separation in the Raman-scattering and magnetization experiments of (La sub(1-y)Nd sub(y)) sub(2/3)Ca sub(1/3)MnO sub(3) (y=0.0, 0.5)

• Published in: Journal of magnetism and magnetic materials 2001-05, Vol.226, p.2000-2001
• Main Authors: Sanjurjo, J A, Granado, E, Rettori, C
• Format: Article
• Language: English
• ISSN: 0304-8853

Raman-scattering and magnetization studies are presented for polycrystalline (La sub(1-y)Nd sub(y)) sub(1-x)Ca sub(x)MnO sub(3) (y=0.0, 0.5, and x=1/3) samples. The low-T Raman spectra for y=0.5 show two strong peaks at approximately 480 and approximately 620cm super(-1) characteristic of the x=0 and x=0.5 (y=0.0) manganites. As T increases, the two modes broaden and decrease in spectral weight. The sample with y=0.0 also shows the two modes at all temperatures, though at low-T they are much less intense than those for y=0.5 sample. The low-field magnetization curve for y=0.5 shows a large thermal hysteresis and a broad ferromagnetic (FM) transition at T sub(c) approximately 80K (cooling) and T sub(c) approximately 120K (warming). In contrast, the sample with y=0.0 shows no thermal hysteresis and a sharp FM transition at T sub(c)=265K. In contrast, the high-field (H sub(app)=5T) curves are very similar for y=0.0 and y=0.5. The differences and similarities between both materials are discussed in terms of the coexistence of an AFM insulating and an FM metallic phase. copyright 2001 Elsevier Science B.V. All rights reserved.