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American Physical Society, Physical review B, 21(73)

DOI: 10.1103/physrevb.73.214301

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Spin-phonon coupling in orthorhombicRMnO3(R=Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Y): A Raman study

Journal article published in 2006 by J. Laverdière, S. Jandl, A. A. Mukhin ORCID, V. Y.-U. Ivanov, V. G. Ivanov, M. N. Iliev
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

The temperature-dependent Raman spectra of orthorhombic RMnO3 (R=Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Y) were studied in the 5–300 K temperature range. It was established that while the materials with large R3+ ionic radius rR and A-type antiferromagnetic order (R=Pr,Nd,Sm) exhibit significant phonon softening and other anomalies with decreasing temperature near and below TN, the effect of magnetic ordering is much weaker or negligible in compounds with R=Eu, Gd, Tb, Dy, Ho, and Y, characterized by small rR and incommensurate magnetic structure. The results are discussed accounting for the variations with rR of the type of magnetic ordering and related spin-phonon interaction.