Structure, magnetization, and resistivity of La1xMxCoO3 (M=Ca, Sr, and Ba)

M. Kriener, C. Zobel, A. Reichl, J. Baier, M. Cwik, K. Berggold, H. Kierspel, O. Zabara, A. Freimuth, and T. Lorenz
Phys. Rev. B 69, 094417 – Published 18 March 2004
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Abstract

We present an investigation of the influence of structural distortions in charge-carrier doped La1xMxCoO3 by substituting La3+ with alkaline-earth metals of strongly different ionic sizes, that is, M=Ca2+, Sr2+, and Ba2+, respectively. We find that both the magnetic properties and the resistivity change nonmonotonically as a function of the ionic size of M. Doping La1xMxCoO3 with M=Sr2+ yields higher transition temperatures to the ferromagnetically ordered states and lower resistivities than doping with either Ca2+ or Ba2+ having a smaller or larger ionic size than Sr2+, respectively. From this observation we conclude that the different transition temperatures and resistivities of La1xMxCoO3 for different M (of the same concentration x) do not only depend on the varying chemical pressures. The local disorder due to the different ionic sizes of La3+ and M2+ plays an important role, too.

  • Received 21 August 2003

DOI:https://doi.org/10.1103/PhysRevB.69.094417

©2004 American Physical Society

Authors & Affiliations

M. Kriener, C. Zobel, A. Reichl, J. Baier, M. Cwik, K. Berggold, H. Kierspel, O. Zabara, A. Freimuth, and T. Lorenz

  • II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany

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Vol. 69, Iss. 9 — 1 March 2004

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