Magnetic ordering and dielectric relaxation in the double perovskite YBaCuFeO5.
J Phys Condens Matter
; 29(14): 145801, 2017 Apr 12.
Article
em En
| MEDLINE
| ID: mdl-28248641
ABSTRACT
Using magnetization, dielectric constant, and neutron diffraction measurements on a high quality single crystal of YBaCuFeO5 (YBCFO), we demonstrate that the crystal shows two antiferromagnetic transitions at [Formula see text] K and [Formula see text] K, and displays a giant dielectric constant with a characteristic of the dielectric relaxation at T N2. It does not show the evidence of the electric polarization for the crystal used for this study. The transition at T N1 corresponds with a paramagnetic to antiferromagnetic transition with a magnetic propagation vector doubling the unit cell along three crystallographic axes. Upon cooling, at T N2, the commensurate spin ordering transforms to a spiral magnetic structure with a propagation vector of ([Formula see text] [Formula see text] [Formula see text]), where [Formula see text], [Formula see text], and [Formula see text] are odd, and the incommensurability δ is temperature dependent. Around the transition boundary at T N2, both commensurate and incommensurate spin ordering coexist.
Texto completo:
1
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Phys Condens Matter
Assunto da revista:
BIOFISICA
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Taiwan