Electronic and vibrational Raman spectroscopy of Nd0.5Sr0.5MnO3 through the phase transitions

Motin Seikh, Md. ; Sood, A. K. ; Narayana, Chandrabhas (2005) Electronic and vibrational Raman spectroscopy of Nd0.5Sr0.5MnO3 through the phase transitions Pramana - Journal of Physics, 64 (1). pp. 119-128. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/pramana/v64/p119/abs.htm

Related URL: http://dx.doi.org/10.1007/BF02704535

Abstract

Raman scattering experiments have been carried out on single crystals of Nd0.5Sr0.5MnO3 as a function of temperature in the range of 320-50 K, covering the paramagnetic insulator-ferromagnetic metal transition at 250 K and the charge-ordering antiferromagnetic transition at 150 K. The diffusive electronic Raman scattering response is seen in the paramagnetic phase which continue to exist even in the ferromagnetic phase, eventually disappearing below 150 K. We understand the existence of diffusive response in the ferromagnetic phase to the coexistence of the different electronic phases. The frequency and linewidth of the phonons across the transitions show significant changes, which cannot be accounted for only by anharmonic interactions.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Manganites; Jahn-Teller Distortion; Raman Scattering; Phonon; Spin Excitation; Spin-phonon Coupling; Electronic Raman Scattering
ID Code:50313
Deposited On:22 Jul 2011 13:55
Last Modified:18 May 2016 04:40

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