Crystallographic Features of the A-Type and CE-Type Antiferromagnetic States in the Simple-Perovskite Manganite System Sr_1-xNd_xMnO₃

Abstract:

The electronic states of Sr_1-xNd_xMnO₃ with the simple perovskite structure are characterized by a three-dimensional highly-correlated electronic system. To understand the detailed features of the A-and CE-type antiferromagnetic states in this system, their crystallographic features for x = 0.47, 0.48, and 0.50 have been investigated mainly by both x-ray powder diffraction and transmission electron microscopy. It was found at room temperature that the crystal structure for x = 0.47 was determined to have the monoclinic C2/m symmetry, while the orthorhombic Imma structure was confirmed for x = 0.48 and 0.50. The in-situ observation for x = 0.47 indicated that, in the heating process from room temperature, the C2/m-to-Imma transition occurred in the paramagnetic state, and that the A-type antiferromagnetic state appeared below about 200 K on cooling. In addition, the cooling from room temperature for x = 0.48 and 0.50 resulted in the direct transitions from the orthorhombic Imma state to the A-and CE-type antiferromagnetic states, respectively. Based on these features, we simply discussed the physical origin of the appearance of the paramagnetic state with the monoclinic symmetry for x = 0.47.

• Periodical: Advanced Materials Research (Volume 409)
• Pages: 532-537
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.409.532
• Online since: November 2011
• Authors: Yusuke Onezawa, Yasuhide Inoue, Masazumi Arao, Yasumasa Koyama
• Keywords: A-Type Antiferromagnetic State, Manganite, Simple Perovskite, Transmission Electron Microscopy (TEM)

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