Low-temperature structural anomalies in Pr0.5Sr0.5CoO3 |
| |
Authors: | A. M. Balagurov I. A. Bobrikov V. Yu. Pomjakushin E. V. Pomjakushina D. V. Sheptyakov I. O. Troyanchuk |
| |
Affiliation: | 1.Frank Laboratory of Neutron Physics,Joint Institute for Nuclear Research,Dubna, Moscow region,Russia;2.Laboratory for Neutron Scattering,Paul Scherrer Institut,Villingen PSI,Switzerland;3.Laboratory for Development and Methods,Paul Scherrer Institut,Villingen PSI,Switzerland;4.Scientific and Practical Materials Research Center,National Academy of Sciences of Belarus,Minsk,Belarus |
| |
Abstract: | The magnetic and crystal structures of the Pr0.5Sr0.5CoO3 metallic ferromagnet have been studied by the neutron diffraction technique. It is demonstrated that below 150 K, the compound is mesoscopically separated into two crystalline phases with different spatial symmetries and with different directions of the magnetic anisotropy. The phase separation exists down to 1.5 K, and at temperatures below 90 K, the low-symmetry phase occupies about 80% of the sample volume. The main structural difference between the phases is the configuration of oxygen atoms around praseodymium and, to a certain extent, around cobalt. The ferromagnetic structure with the magnetic moment lying in the basal plane of the structure (μCo ≈ 1.7 μ B at 1.5 K) arises at 234 K, whereas the component directed along the long axis of the unit cell appears at 130 K. The formation of the new structural phase and change in the orientation of the magnetic moment give rise to the anomalies of the physical and magnetic characteristics of this compound observed earlier at temperatures about 120 K. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|