A comparative Raman study between YbVO3 and YVO3

S. Jandl, A.A. Nugroho, T.T.M. Palstra

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Abstract

An orbital ordering effect is observed in YbVO3 around 170 K while the crystal structure is orthorhombic (space group pnma). A monoclinic transition has been reported below TN = 104 K, while according to recent specific heat measurements, it occurs at 170 K. The crystal structure of YVO3 at 300 K is also orthorhombic. It becomes monoclinic at Tc = 200 K and back orthorhombic at T = 77 K. Spins order into the C-type antiferromagnetic structure below TN1 = 116 K and the order changes into the G-type antiferromagnetic
structure below TN2 = 77 K. Controversial interpretations of YVO3 Raman active excitations have been reported. For instance the 489 and 679 cm-1 excitations have been assigned either to phonons or orbitons in two recent studies. In this communication we present a micro-Raman study of YbVO3 and YVO3 Raman active excitations as a function of temperature in order to trace the multiple phase transitions. Also by comparing the two single crystals spectra and previous studies in rare-earth manganites, high energy Raman active excitations are tentatively assigned.
Original languageEnglish
Article number032035
Number of pages4
JournalJournal of physics: Conference series
Volume200
DOIs
Publication statusPublished - 2010
Externally publishedYes
EventInternational Conference on Magnetism, ICM 2009 - Karlsruhe, Germany
Duration: 26 Jul 200931 Jul 2009

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