title: Raman study of the antiferromagnetic phase transitions in hexagonal YMnO3 and LuMnO3.
abstract: The A(1), E(1) and E(2) Raman active modes in hexagonal YMnO(3) and LuMnO(3) single crystals are studied as a function of temperature and compared with previous measurements. In addition to anharmonicity, some phonon frequencies show below T(N) anomalous temperature dependences that reflect the atomic displacements while some other phonon frequencies are more sensitive to the spin-phonon coupling.
authors.affiliation: Département de Physique, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke, J1K 2R1, Canada.
authors.forename: J
authors.initials: J
authors.lastname: Vermette
authors.forename: S
authors.initials: S
authors.lastname: Jandl
authors.forename: A A
authors.initials: AA
authors.lastname: Mukhin
authors.forename: V Yu
authors.initials: VY
authors.lastname: Ivanov
authors.forename: A
authors.initials: A
authors.lastname: Balbashov
authors.forename: M M
authors.initials: MM
authors.lastname: Gospodinov
authors.forename: L
authors.initials: L
authors.lastname: Pinsard-Gaudart