We report magnetisation, conductivity and structural data on the Ruddlesden-Popper MnIII/MnIV oxides LnSr2Mn2O7(Ln = La, Tb); while LnSr2Mn2O7 undergoes an insulator-metal transition and an increase in spontaneous magnetisation at 132 K, the isostructural terbium compound is semiconducting and paramagnetic throughout the range 4.2 < T/K < 300.
P. D. Battle, M. A. Green, N. S. Laskey, J. E. Millburn, M. J. Rosseinsky, S. P. Sullivan and J. F. Vente, Chem. Commun., 1996, 767 DOI: 10.1039/CC9960000767
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