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000205480 1001_ $$0P:(DE-H253)PIP1010142$$aKozlenko, Denis$$b0
000205480 245__ $$aPressure-induced antiferromagnet-ferromagnet transition and a change in the spin state of Co in $La_{0.5}Ba_{0.5}CoO_{2.8}$
000205480 260__ $$aHeidelberg [u.a.]$$bSpringer$$c2014
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000205480 520__ $$aThe crystal and magnetic structures of anion-deficit cobaltite La0.5Ba0.5CoO2.8 have been studied by theX-ray and neutron diffraction methods at high pressures up to 30 and 6 GPa, respectively. A structure transi-tion from the cubic phase with symmetry Pm m to the tetragonal phase with symmetry P4/mmm has beenobserved in this compound at P ≈ 3 GPa. It is accompanied by the change of the ground antiferromagneticstate of the G type to the ferromagnetic state because of a change in the electronic configuration of Co3+ ions.Possible mechanisms of the observed magnetic phase transition, as well as the role of the superexchange inter-actions between Co3+ ions in various spin states in the formation of magnetic properties, have been discussed.Pressure induced change in the magnetic state of La0.5Ba0.5CoO2.8 significantly differs from related stoichi-ometric compounds La0.5A0.5CoO3.0 (A = Sr, Ca), where the ground ferromagnetic state is formed and thesign of the pressure dependence of the Curie temperature depends on the element A.
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000205480 7001_ $$0P:(DE-HGF)0$$aRutkauskas, A. V.$$b1
000205480 7001_ $$0P:(DE-HGF)0$$aDang, N. T.$$b2
000205480 7001_ $$0P:(DE-HGF)0$$aGolosova, N. O.$$b3
000205480 7001_ $$0P:(DE-H253)PIP1008531$$aKichanov, Sergey$$b4$$eCorresponding author
000205480 7001_ $$0P:(DE-H253)PIP1014493$$aDubrovinsky, Leonid$$b5
000205480 7001_ $$0P:(DE-H253)PIP1007496$$aLiermann, Hanns-Peter$$b6
000205480 7001_ $$0P:(DE-H253)PIP1006769$$aMorgenroth, Wolfgang$$b7
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