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Issue 9, 1996
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Structure and magnetotransport properties of the layered manganites Re1.2Sr1.8Mn2O7(RE = La, Pr, Nd)

Abstract

We have examined the magnetotransport properties and the structure, by Rietveld refinement of powder X-ray data, of the phases RE1.2Sr1.8Mn2O7(RE = La, Pr, Nd). We find that on cooling, La2Sr1.8Mn2O7 undergoes a transition to a nearly perfect ferromagnet with 90% magnetization at 1.45 T, as reported by earlier workers, but the Pr and Nd phases show only a small magnetization that grows gradually as the temperature is decreased. There seems to be significant correlation between electrical transport and the Jahn-Teller elongation of the apical Mn–O bonds in these systems. The elongation of the apical Mn-O bonds forces the nine-coordinate rock-salt site to be occupied preferentially by the smaller rare-earth-metal cations. This preferential occupation is reliably obtained from the X-ray refinement. All three title phases show a magnetoresistance ratio of about 4 (corresponding to a magnetoresistance, [R(0)–R(H)]/R(0), of about 75%) at a field of 7 T and temperatures around 100 K.

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Article type: Paper
DOI: 10.1039/JM9960601585
Citation: J. Mater. Chem., 1996,6, 1585-1590

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    Structure and magnetotransport properties of the layered manganites Re1.2Sr1.8Mn2O7(RE = La, Pr, Nd)

    R. Seshadri, C. Martin, A. Maignan, M. Hervieu, B. Raveau and C. N. R. Rao, J. Mater. Chem., 1996, 6, 1585
    DOI: 10.1039/JM9960601585

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