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      https://www.ias.ac.in/article/fulltext/pram/064/01/0119-0128

    • Keywords

       

      Manganites; Jahn-Teller distortion; Raman scattering; phonon; spin excitation; spin-phonon coupling; electronic Raman scattering

    • 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.

    • Author Affiliations

       

      Md Motin Seikh1 2 A K Sood1 3 Chandrabhas Narayana1

      1. Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore - 560 064, India
      2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore - 560 012, India
      3. Department of Physics, Indian Institute of Science, Bangalore - 560 012, India

    • Dates

       
      Published
      January 2005
      Manuscript received
      31 May 2004
      Manuscript revised
      25 October 2004
      Accepted
      29 October 2004

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