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Temperature-dependent Brillouin scattering studies of surface acoustic modes in Nd0.5Sr0.5MnO3

Seikh, MM and Narayana, C and Parashar, S and Sood, AK (2003) Temperature-dependent Brillouin scattering studies of surface acoustic modes in Nd0.5Sr0.5MnO3. In: Solid State Communications, 127 (3). pp. 209-214.

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Abstract

Brillouin scattering experiments are carried out to study the surface acoustic waves in Nd0.5Sr0.5MnO3 as a function of temperature in the range of 40–300 K covering the metal-insulator and charge-ordering phase transitions. The surface modes include surface Rayleigh wave, pseudo-surface acoustic wave (PSAW) and high velocity PSAW. The observed softening of the sound velocities for the surface modes below paramagnetic to ferromagnetic transition, Tc is related to the softening of the C44 elastic constant. The subsequent hardening of the sound velocity below the charge ordering transition temperature Tco is attributed to the coupling of the acoustic phonon to the charge ordered state via long range ordering of the strong Jahn–Teller (JT) distortion.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Elsevier Science Ltd.
Keywords: Manganites;Brillouin scattering;Phase transition;Elastic constants;Charge-ordering;Jahn–Teller distortion
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 26 Jul 2004
Last Modified: 19 Sep 2010 04:14
URI: http://eprints.iisc.ernet.in/id/eprint/1104

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