Crystal structures and magnetic order of La0.5+deltaA0.5-deltaMn0.5+epsilonRu0.5-epsilonO3 (A= Ca, Sr, Ba): Possible orbital glass ferromagnetic state
Granado, Eduardo · Huang, Qingzhen · Lynn, Jeff W. · Gopalakrishnan, J. · Ramesha, K.
Original · EN
The crystallographic and magnetic properties of La0.5+deltaA0.5-deltaMn0.5+epsilonRu0.5-epsilonO3 (A= Ca, Sr, Ba) were investigated by means of neutron powder diffraction. All studied samples show the orthorhombic perovskite crystal structure, space group Pnma, with regular (Mn,Ru)O6 octahedra and no chemical ordering of the Mn3+ and Ru4+ ions. Ferromagnetic spin structures were observed below Tc 200-250 K, with an average ordered moment of 1.8-2.0 Bohr magnetons per (Mn,Ru). The observation of long-range ferromagnetism and the absence of orbital ordering are rationalized in terms a strong Mn-Ru hybridization, which may freeze the orbital degree of freedom and broaden the eg valence band, leading to an orbital-glass state with carrier-mediated ferromagnetism.
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