A comparative study of the electron- and hole-doped compositions of single crystalline Nd1−xCaxMnO3 ( and 0.4) by Brillouin scattering |
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| Authors: | Md Motin Seikh Chandrabhas Narayana AK Cheetham CNR Rao |
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| Institution: | aChemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O. Bangalore, India 560064;bSolid State and Structural Chemistry Unit, Indian Institute of Science, India 560 012;cMaterials Research Laboratory, University of California, Santa Barbara, CA 93106, USA |
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| 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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