Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO0.89F0.11FeAs

The recently discovered oxypnictide superconductors are layered, low carrier density compounds with many similarities to the high-Tc cuprates. An important question is whether they also exhibit weak-coupling across randomly oriented grain boundaries. In this work we show considerable evidence for su...

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Bibliographic Details
Published in:Applied physics letters 2008-06, Vol.92 (25)
Main Authors: Yamamoto, A., Jiang, J., Tarantini, C., Craig, N., Polyanskii, A. A., Kametani, F., Hunte, F., Jaroszynski, J., Hellstrom, E. E., Larbalestier, D. C., Jin, R., Sefat, A. S., McGuire, M. A., Sales, B. C., Christen, D. K., Mandrus, D.
Format: Article
Language:English
Subjects:
CARRIER DENSITY
GRAIN BOUNDARIES
GRAIN SIZE
IRON ARSENIDES
LANTHANUM FLUORIDES
LANTHANUM OXIDES
MAGNETIZATION
MATERIALS SCIENCE
SUPERCONDUCTORS
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Summary:The recently discovered oxypnictide superconductors are layered, low carrier density compounds with many similarities to the high-Tc cuprates. An important question is whether they also exhibit weak-coupling across randomly oriented grain boundaries. In this work we show considerable evidence for such weak coupling by study of the dependence of magnetization in bulk and powdered samples. Bulk sample magnetization curves show very little hysteresis while remanent magnetization shows almost no sample size dependence, even after powdering. We conclude that these samples exhibit substantial electromagnetic granularity on a scale approximating the grain size, though we cannot yet determine whether this is intrinsic or extrinsic.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2952195