Synthesis and structural properties of n = 1 Ruddlesden-Popper manganites Nd1-xCa1+xMnO4

T. Nagai, A. Yamazaki, K. Kimoto, Y. Matsui

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6 Citations (Scopus)

Abstract

Polycrystalline samples of n = 1 Ruddlesden-Popper manganites Nd1-xCa1+xMnO4 (0.55 ≦ x ≦ 1.00) were synthesized by a solid-state reaction. X-ray diffraction (XRD) and electron diffraction (ED) measurements confirmed that the fundamental crystal structure at room temperature consists of three distorted K2NiF4-types: orthorhombic Bmab (64) phase in 0.55 ≦ x < 0.73, orthorhombic Acam (64) phase in 0.73 ≦ x < 0.85 and tetragonal I41/acd (142) phase in 0.85 ≦ x ≦ 1.00. Furthermore, in a whole range of 0.55 ≦ x ≦ 0.75, low-temperature magnetic and ED measurements revealed charge-orbital ordering (COO) states, which are accompanied by suppression of magnetization and structural modulations with q = (1 - x)a*. The COO transition temperatures are high with a maximum of ∼330 K at x = 0.67, and then higher than those in non-distorted n = 1 Ruddlesden-Popper manganites. The observations suggest that COO states are much stabilized by the distortion in the fundamental structures.

Original languageEnglish
Pages (from-to)247-252
Number of pages6
JournalJournal of Alloys and Compounds
Volume453
Issue number1-2
DOIs
Publication statusPublished - 2008 Apr 3

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Keywords

  • Crystal structure and symmetry
  • Electronic states (localized)
  • Scanning and transmission electron microscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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