Electronic and vibrational Raman spectroscopy of Nd0.5Sr0.5MnO3 through the phase transitions |
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Authors: | Md Motin Seikh A. K. Sood Chandrabhas Narayana |
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Affiliation: | (1) Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., 560 064 Bangalore, India;(2) Solid State and Structural Chemistry Unit, Indian Institute of Science, 560 012 Bangalore, India;(3) Department of Physics, Indian Institute of Science, 560 012 Bangalore, India |
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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. |
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Keywords: | Manganites Jahn-Teller distortion Raman scattering phonon spin excitation spin-phonon coupling electronic Raman scattering |
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