Coexistence of antiferromagnetic order and spin glass freezing in YBa2 (Cu0.88Fe0.12)3O6.5

✍ Scribed by I. Mirebeau; C. Bellouard; M. Hennion; G. Jehanno; V. Caignaert; A.J. Dianoux; T.E. Phillips; K. Moorjani

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 952 KB
• Volume: 184
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)90395-f

✦ Synopsis

We have performed neutron diffraction, inelastic neutron scattering and M0ssbauer measurements in a semiconducting deoxygenated YBaE(CUosaF%.~2)3Oy (y-~ 6.5) sample. A 3D antiferromagnetic order is observed, with a (~½~) peak and a N6el temperature of 430 K. The magnetic structure, alternating antiferromagnetic (AF) sheets with similar moment values on both Cu I and Cu II sites, coexists with static and dynamical disorder, induced by frustrated Fe spins in the Cu I chains. On lowering the temperature, the Fe spins undergo a spin glass transition below Tr~ 70 K. Concomitantly, the AF order shows a reentrant behavior, characterized by a slight decrease of the ( ½ ½ ~ ) peak intensity. The results are discussed in comparison with undoped deoxygenated compounds.