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.


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 044005


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