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The magnetostructural properties of metallic Pr0.50Sr0.50CoO3 investigated by x-ray absorption and neutron techniques

AutorPadilla-Pantoja, J.; Herrero Martín, Javier ; Bozzo, B.; Rodríguez-Velamazán, J. A.; Blasco, Javier; García Muñoz, Josep Lluís
Fecha de publicación2016
CitaciónSCTE (2016)
ResumenCobalt-based perovskites are attracting the interest as strongly correlated electron systems due to the relevance of the cobalt spin state for their functional properties. The spin state of trivalent cobalt is a key feature in half-doped Pr0.50A0.50CoO3 (A: Ca or Sr) perovskites. In these compounds the spin-lattice coupling gives rise to non-conventional magnetostructural and electronic transitions, the interpretation of which has been controversial. The properties of Pr0.50Sr0.50CoO3 (PSCO) differ from those in Pr0.50Ca0.50CoO3 (PCCO), where a spin-state change has been proved to induce a partial Pr3+ to Pr4+ valence shift and a exotic metal-insulator transition around 80 K. Moreover, recent works have confirmed the importance of the spin-lattice coupling in Pr0.50Sr0.50CoO3 reporting magnetostructural changes at 120K. We have investigated the properties of PSCO (always metallic, and ferromagnetic below TC ~ 230 K) across the unexpected magnetostructural transition at TS ~120 K [3-6]. X-ray absorption experiments (XAS) at the Pr M4,5 and L3 edges rule out any trace of Pr4+ below TS. By means of x-ray circular dichroism (XMCD) at Co L edges, the unusual and coupled evolution of the orbital and spin moments demonstrate the relevance of the spin-orbit coupling for the stabilization of two distinct ferromagnetic phases in this metallic perovskite. The Co spin state model is discussed on the basis of charge transfer multiplet calculations of the dichroic spectral shape. In addition, neutron diffraction sheds light on the link between the Imma→I4/mcm symmetry change and the original magnetic behavior of PSCO at TS.
DescripciónResumen del trabajo presentado a la 20th International Conference on Solid Compounds of Transition Elements, celebrada del 11 al 15 de abril de 2016 en Zaragoza (España).
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