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

Motin Seikh, Md. ; Narayana, Chandrabhas ; Cheetham, A. K. ; Rao, C. N. R. (2005) A comparative study of the electron- and hole-doped compositions of single crystalline Nd1−xCaxMnO3 (x=0.6 and 0.4) by Brillouin scattering Solid State Sciences, 7 (12). pp. 1486-1491. ISSN 1293-2558

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S12932...

Related URL: http://dx.doi.org/10.1016/j.solidstatesciences.2005.06.016

Abstract

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.

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