title: Coexistence of antiferromagnetic and spin cluster glass order in the magnetoelectric relaxor multiferroic PbFe 0.5 Nb 0.5 O3.
abstract: The coexistence of cluster glass with long-range antiferromagnetic order in the relaxor ferroelectric PbFe 0.5 Nb 0.5 O3 is elucidated. While the transition at T(N) = 153 K on the infinite antiferromagnetic cluster induces 3m symmetry with large EH2 magnetoelectric response, the disconnected subspace of isolated Fe3+ ions and finite clusters accommodates the cluster glass below T(g) = 10.6 K with field-induced m' symmetry and EH-type magnetoelectric response. Critical slowing-down, memory and rejuvenation after aging, occurrence of a de Almeida-Thouless phase line, and stretched exponential relaxation of remanence corroborate the glass nature.
authors.affiliation: Angewandte Physik, Universität Duisburg-Essen, Lotharstrasse 1, D-47048 Duisburg, Germany. wolfgang.kleemann@uni-due.de
authors.forename: W
authors.initials: W
authors.lastname: Kleemann
authors.forename: V V
authors.initials: VV
authors.lastname: Shvartsman
authors.forename: P
authors.initials: P
authors.lastname: Borisov
authors.forename: A
authors.initials: A
authors.lastname: Kania