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Research article

Zone center phonons of the orthorhombic RMnO₃ (R = Pr, Eu, Tb, Dy, Ho) perovskites

HC Gupta¹ and Upendra Tripathi²

¹  Physics Department, Indian Institute of Technology, Hauz Khas, New Delhi, India

²  Physics Department, Amity University, Noida, UttarPradesh, India

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PMC Physics B 2008, 1:9doi:10.1186/1754-0429-1-9

Published:	17  March  2008

Abstract

A short range force constant model (SRFCM) has been applied for the first time to investigate the phonons in RMnO₃ (R = Pr, Eu, Tb, Dy, Ho) perovskites in their orthorhombic phase. The calculations with 17 stretching and bending force constants provide good agreement for the observed Raman frequencies. The infrared frequencies have been assigned for the first time.

PACS Codes: 36.20.Ng, 33.20.Fb, 34.20.Cf