title: High-pressure synthesis, structural and complex magnetic properties of the ordered double perovskite Pb2NiReO6.
abstract: The ordered double perovskite Pb2NiReO6 has been prepared at 6 GPa and temperatures ranging from 1273 to 1373 K. Its crystal structure determined by X-ray powder diffraction and selected area electron diffraction shows monoclinic symmetry with centrosymmetric space group I2/m (a = 5.6021(1) Å, b = 5.6235(1) Å, c = 7.9286(1) Å and β = 90.284°(1)). High angle annular dark field microscopy studies reveal the existence of compositional microdomains. The compound displays a re-entrant spin-glass transition from a ferrimagnetic ordering below T(N) ~ 37 K between the Re(+5) and Ni(+3) (high spin configuration) magnetic sublattices to a spin-glass configuration. Magnetic field dependent magnetization measurements revealed wasp-waisted hysteresis loops at 5 K. These shaped features originate from the antiferromagnetic/ferromagnetic (AFM/FM) competing interactions.
authors.affiliation: Dpto. de Química Inorgánica, Facultad de Químicas, Universidad Complutense de Madrid, 28040 Spain. maaf@ucm.es.
authors.forename: Teodora
authors.initials: T
authors.lastname: Stoyanova-Lyubenova
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: Dos santos-García
authors.forename: Esteban
authors.initials: E
authors.lastname: Urones-Garrote
authors.forename: María José
authors.initials: MJ
authors.lastname: Torralvo
authors.forename: Miguel Á
authors.initials: MÁ
authors.lastname: Alario-Franco