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The crystallographic and magnetic properties ofLa{0.5+delta}A{0.5-delta}Mn{0.5+epsilon}Ru{0.5-epsilon}O{3} (A= Ca, Sr, Ba)were investigated by means of neutron powder diffraction. All studied samplesshow the orthorhombic perovskite crystal structure, space group Pnma, withregular (Mn,Ru)O{6} octahedra and no chemical ordering of the Mn3+ and Ru4+ions. Ferromagnetic spin structures were observed below Tc ~ 200-250 K, with anaverage ordered moment of ~ 1.8-2.0 Bohr magnetons per (Mn,Ru). The observationof long-range ferromagnetism and the absence of orbital ordering arerationalized in terms a strong Mn-Ru hybridization, which may freeze theorbital degree of freedom and broaden the eg valence band, leading to anorbital-glass state with carrier-mediated ferromagnetism

physical review. b, condensed matter and materials physics

Crystal structures and magnetic order of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mrow><mml:mn>0.5</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub><mml:mspace width="0.2em" /><mml:msub><mml:mi>A</mml:mi><mml:mrow><mml:mn>0.5</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:mrow><mml:mn>0.5</mml:mn><mml:mo>+</…

Crystal structures and magnetic order ofLa0.5+δA0.5−δMn0.5+