Affordable Access

Publisher Website

Vibrational anisotropy of Mn3+O6octahedron and phase separation in La0.67− yPryCa0.33MnO3manganites

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
135
Issue
6
Identifiers
DOI: 10.1016/j.ssc.2005.05.028
Keywords
  • D. Phase Separation
  • D. Vibrational Anisotropy Of Mn3+O6Octahedron
  • E. Relative Young'S Modulus
Disciplines
  • Physics

Abstract

Abstract The role of vibrational anisotropy of Mn 3+O 6 octahedron in the phase separation behavior of La 0.67− y Pr y Ca 0.33MnO 3 ( x=0, 0.15, 0.25 and 0.30) has been investigated by means of magnetization M, internal friction Q −1, Young's modulus E along with the X-ray powder diffraction measurements. For the samples with y=0 and 0.15, the Q −1 exhibits three peaks in the ferromagnetic region, which are attributed to the intrinsic inhomogeneity of ferromagnetic phase, i.e. the electronic phase separation with the coexistence of insulating and conducting phases. However, both the samples with y=0.25 and 0.30 undergo a magnetic phase separation with the coexistence of the antiferromagnetic and ferromagnetic phases, and the Q −1 peaks related to the electronic phase separation have not been observed. In addition, the Q −1 exhibits a peak in the paramagnetic region for all samples, which may result from the formation of magnetic clusters. We observed that the evolution from electronic to magnetic phase separation is close related to the rapid increase in the ratio of two kinds of Jahn–Teller distortion modes Q 3 and Q 2, i.e. Q 3/ Q 2. A schematic phase diagram is given in the text, and it is suggested that the enhancement of vibrational anisotropy of Mn 3+O 6 octahedron plays a key role in the evolution from electronic to magnetic phase separation.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

Strain induced phase separation in La0.67Ca0.33MnO...

on Journal of Physics and Chemist... Jan 01, 2006

Phase separation induced by oxygen deficiency in L...

on Solid State Communications Jan 01, 2007

Studies of the microstructures of YBa2Cu3O7− x/La0...

on Physica C Superconductivity Jan 01, 2002

Possible magnetic phase separation in Ru-doped La0...

on Journal of Magnetism and Magne... Jan 01, 2003
More articles like this..