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In half-doped Pr0.50A0.50CoO3 metallic perovskites, the spin-lattice couplingbrings about distinct magnetostructural transitions for A=Ca and A=Sr attemperatures close to 100 K. However, the ground magnetic properties ofPr0.50Sr0.50CoO3 (PSCO) strongly differ from Pr0.50Ca0.50CoO3 ones, where apartial Pr3+ to Pr4+ valence shift and Co spin transition makes the systeminsulating below the transition. This work investigates and describes therelationship between the Imma-to-I4/mcm symmetry change [Padilla-Pantoja et al,Inorg. Chem. 53, 12297 (2014)] and the original magnetic behavior of PSCOversus temperature and external magnetic fields. The FM1 and FM2 ferromagneticphases, above and below the magnetostructural transition (TS1=120 K) have beeninvestigated. The FM2 phase of PSCO is composed of [100] FM domains, withmagnetic symmetry Im'm'a (mz=0). The magnetic space group of the FM1 phase isFm'm'm (with mx=my). Neutron data analyses in combination with magnetometry andearlier reports results agrees with a reorientation of the magnetization axisby 45 deg within the a-b plane across the transition, in which the systemretains its metallic character. The presence below TS1 of conjugated magneticdomains, both of Fm'm'm symmetry but having perpendicular spin orientationsalong the diagonals in the xy-plane of the tetragonal unit cell, is at theorigin of the anomalies observed in the macroscopic magnetization. A relativelysmall field m0H > 30 mT is able to reorient the magnetization within the a-bplane, whereas a higher field (m0H,[H//z] >1.2 T at 2K) is necessary to alignthe Co moments perpendicular to a-b plane. Such a spin reorientation, in whichthe orbital and spin components of the Co moment rotate joined by 45deg, wasnot observed with other lanthanides different to praseodymium.

Magnetostructural coupling, magnetic ordering and cobalt spin reorientation in metallic Pr0.50Sr0.50CoO3 cobaltite