Raman scattering in charge-ordered Pr0.63Ca0.37MnO3: Anomalous temperature dependence of linewidth

R. Gupta; G. Venketeswara Pai; A. K. Sood; T. V. Ramakrishnan; C. N. R. Rao

doi:10.1209/epl/i2002-00417-3

All issues

Volume 58 / No 5 (June 2002)

Europhys. Lett., 58 5 (2002) 778-784

Abstract

Issue		Europhys. Lett. Volume 58, Number 5, June 2002


Page(s)		778 - 784
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2002-00417-3
Published online		01 May 2002

Europhys. Lett., 58 (5), pp. 778-784 (2002)

Raman scattering in charge-ordered Pr_0.63Ca_0.37MnO₃: Anomalous temperature dependence of linewidth

R. Gupta¹, G. Venketeswara Pai², A. K. Sood¹, T. V. Ramakrishnan² and C. N. R. Rao³

¹ Department of Physics, Indian Institute of Science - Bangalore 560012, India
² Centre for Condensed Matter Theory, Department of Physics Indian Institute of Science - Bangalore 560012, India
³ CSIR Centre for Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research - Jakkur P.O., Bangalore 560064, India

Corresponding authors: rajeev@physics.iisc.ernet.in, venkat@physics.iisc.ernet.in, asood@physics.iisc.ernet.in, tvrama@physics.iisc.ernet.in, cnrrao@jncasr.ac.in

Received: 18 October 2001
Accepted: 6 March 2002

Abstract

We report on the evolution of the Raman-active A_g phonon modes in the charge-ordered manganite Pr_0.63Ca_0.37MnO₃ as a function of temperature from 300 K to 25 K. Our studies reveal that the linewidths of the A_g(2) and A_g(4) phonons increase as temperature decreases. This anomalous temperature dependence of phonon lineshapes, seen for the first time in charge-ordered manganites, can be quantitatively understood in terms of a strong spin-phonon coupling involving $t_{2g}$ spins and A_g phonons.

PACS: 75.30.Vn – Colossal magnetoresistance / 78.30.-j – Infrared and Raman spectra / 72.10.Di – Scattering of phonons, magnons, and other nonlocalized excitations

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