Magnetic ground state and magnon-phonon interaction in multiferroic h−YMnO3 by Holm, S, Kreisel, A, Schäffer, T, Bakke, A, Bertelsen, M, Hansen, U, Retuerto, M, Larsen, J, Prabhakaran, D, Deen, P, Yamani, Z, Birk, J, Stuhr, U, Niedermayer, C, Fennell, A, Andersen, B, Lefmann, K