A comparative study of the electron- and hole-doped compositions of single crystalline Nd1−xCaxMnO3 (x=0.6 and 0.4) by Brillouin scattering

• Published in: Solid state sciences 2005-12, Vol.7 (12), p.1486-1491
• Main Authors: Seikh, Md. Motin, Narayana, Chandrabhas, Cheetham, A.K., Rao, C.N.R.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Defects and impurities in crystals; microstructure; Domain effects, magnetization curves, and hysteresis; Doping and impurity implantation in other materials; Exact sciences and technology; Magnetic properties and materials; Magnetization curves, hysteresis, Barkhausen and related effects; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Physics; Structure of solids and liquids; crystallography
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2005.06.016

In order to understand the differences between the nature of the electron- and the hole-doped compositions of rare earth manganates, properties of single crystals of Nd1−xCaxMnO3 with x=0.6 and 0.4 have been investigated. In the electrical resistivity measurements, the electron-doped (x=0.6) composition shows no effect of magnetic field unlike the hole-doped (x=0.4) composition, but both exhibit similar current-induced changes. Brillouin scattering studies show that the x=0.6 and 0.4 compositions show softening of the modes on cooling the samples towards charge-ordering transitions. The strength of coupling between the eg orbitals and the elastic strain is considerably larger in the hole-doped composition containing a larger population of Mn3+ ions.