Magnetic properties of Ruddlesden-Popper phases Sr 3 − x Y x ( Fe 1.25 Ni 0.75 ) O 7 − δ : A combined experimental and theoretical investigation
Journal article, 2018
We present a comprehensive study of the magnetic properties of Sr3-xYx(Fe1.25Ni0.75)O-7(-delta )(0 <= x <= 0.75). Experimentally, the magnetic properties are investigated using superconducting quantum interference device (SQUID) magnetometry and neutron powder diffraction (NPD). This is complemented by a theoretical study based on density functional theory as well as the Heisenberg exchange parameters. Experimental results show an increase in the Ned temperature (T-N) with an increase of Y concentrations and O occupancy. The NPD data reveal that all samples are antiferromagnetically ordered at low temperatures, which has been confirmed by our theoretical simulations for the selected samples. Our first-principles calculations suggest that the three-dimensional magnetic order is stabilized due to finite interlayer exchange couplings. The latter give rise to finite interlayer spin-spin correlations, which disappear above T-N.
Author
Samara Keshavarz
Uppsala University
Sofia Kontos
Uppsala University
Dariusz Wojciech Wardecki
Chalmers, Chemistry and Chemical Engineering, Energy and Material
University of Warsaw
Stockholm University
Yaroslav O. Kvashnin
Uppsala University
Manuel Pereiro
Uppsala University
Swarup K. Panda
Uppsala University
Biplab Sanyal
Uppsala University
Olle Eriksson
Örebro University
Uppsala University
Jekabs Grins
Stockholm University
Gunnar Svensson
Stockholm University
Klas Gunnarsson
Uppsala University
Peter Svedlindh
Uppsala University
Physical Review Materials
24759953 (eISSN)
Vol. 2 4 044005Subject Categories
Inorganic Chemistry
Other Physics Topics
Condensed Matter Physics
DOI
10.1103/PhysRevMaterials.2.044005