Spin lattice coupling in multiferroic hexagonal YMnO3

Pramana

Fernande Moussa³  Stéphane Pailhès³  Xavier Fabrèges³  Martine Hennion³  Sylvain Petit1³  Louis-Pierre Regnault¹  Alexander Ivanov¹  Loreynne Pinsard² 

[1] CEA-Grenoble, DRFMC-SPSMS-MDN, 17 rue des Martyrs, F-38054 Grenoble, France$$;Laboratoire de Chimie des Solides, URA 446 CNRS, Université Paris-Sud, Orsay, France$$;LLB, CEA-CNRS (UMR 12), CE-Saclay F-91190 Gif sur Yvette, France$$

关键词: Multiferroic;    manganites;    spin phonon hybridization;    inelastic neutron scattering.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Aiming to shed light on the possible existence of hybrid phonon—magnon excitations in multiferroic manganites, neutron scattering measurements have been un-dertaken at LLB and ILL on the particular case of hexagonal YMnO3. Our experiments focused on a transverse acoustic phonon mode polarized along the ferroelectric axis. The neutron data show that below the magnetic transition, this particular phonon mode splits in two different branches. The upper branch is found to coincide with a spin wave mode. This manifestation of a strong spin-lattice coupling is discussed in terms of a possible hybridization between the two types of elementary excitations, the phonon and magnons.

【 授权许可】

Unknown