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
Artikel i vetenskaplig tidskrift, 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.
Författare
Samara Keshavarz
Uppsala universitet
Sofia Kontos
Uppsala universitet
Dariusz Wojciech Wardecki
Chalmers, Kemi och kemiteknik, Energi och material
Uniwersytet Warszawski
Stockholms universitet
Yaroslav O. Kvashnin
Uppsala universitet
Manuel Pereiro
Uppsala universitet
Swarup K. Panda
Uppsala universitet
Biplab Sanyal
Uppsala universitet
Olle Eriksson
Örebro universitet
Uppsala universitet
Jekabs Grins
Stockholms universitet
Gunnar Svensson
Stockholms universitet
Klas Gunnarsson
Uppsala universitet
Peter Svedlindh
Uppsala universitet
Physical Review Materials
24759953 (eISSN)
Vol. 2 4 044005Ämneskategorier
Oorganisk kemi
Annan fysik
Den kondenserade materiens fysik
DOI
10.1103/PhysRevMaterials.2.044005