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

A. Yamamoto; J. Jiang; C. Tarantini; N. Craig; A. A. Polyanskii; F. Kametani; F. Hunte; J. Jaroszynski; E. E. Hellstrom; D. C. Larbalestier; R. Jin; A. S. Sefat; M. A. McGuire; B. C. Sales; D. K. Christen; D. Mandrus

doi:10.1063/1.2952195

Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO_0.89F_0.11 FeAs

A. Yamamoto, J. Jiang, C. Tarantini, N. Craig, A. A. Polyanskii, F. Kametani, F. Hunte, J. Jaroszynski, E. E. Hellstrom, D. C. Larbalestier, R. Jin, A. S. Sefat, M. A. McGuire, B. C. Sales, D. K. Christen, D. Mandrus

Correlated Electron Materials

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55 Scopus citations

Abstract

The recently discovered oxypnictide superconductors are layered, low carrier density compounds with many similarities to the high- T_c 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.

Original language	English
Article number	252501
Journal	Applied Physics Letters
Volume	92
Issue number	25
DOIs	https://doi.org/10.1063/1.2952195
State	Published - 2008

Funding

We are very grateful to Alex Gurevich and Peter Lee for discussions. Work at the NHMFL was supported by IHRP 227000-520-003597-5063 under NSF Cooperative Agreement DMR-0084173, by the State of Florida, by the DOE, by NSF-FRG DMR-0514592 and by AFOSR under Grant No. FA9550-06-1-0474. Work at ORNL was supported by the Division of Materials Science and Engineering, Office of Basic Energy Sciences under contract DE-AC05-00OR22725. A.Y. is supported by a fellowship of the JSPS.

Funders	Funder number
IHRP	227000-520-003597-5063
NSF-FRG	DMR-0514592
National Science Foundation	DMR-0084173
U.S. Department of Energy
Air Force Office of Scientific Research	FA9550-06-1-0474
Basic Energy Sciences	DE-AC05-00OR22725
Division of Materials Sciences and Engineering
Japan Society for the Promotion of Science

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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. (2008). Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO_0.89F_0.11 FeAs. Applied Physics Letters, 92(25), Article 252501. https://doi.org/10.1063/1.2952195

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

abstract = "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.",

author = "A. Yamamoto and J. Jiang and C. Tarantini and N. Craig and Polyanskii, {A. A.} and F. Kametani and F. Hunte and J. Jaroszynski and Hellstrom, {E. E.} and Larbalestier, {D. C.} and R. Jin and Sefat, {A. S.} and McGuire, {M. A.} and Sales, {B. C.} and Christen, {D. K.} and D. Mandrus",

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Yamamoto, A, Jiang, J, Tarantini, C, Craig, N, Polyanskii, AA, Kametani, F, Hunte, F, Jaroszynski, J, Hellstrom, EE, Larbalestier, DC, Jin, R, Sefat, AS, McGuire, MA, Sales, BC, Christen, DK & Mandrus, D 2008, 'Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO_0.89F_0.11 FeAs', Applied Physics Letters, vol. 92, no. 25, 252501. https://doi.org/10.1063/1.2952195

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T1 - Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO0.89F0.11 FeAs

AU - Yamamoto, A.

AU - Jiang, J.

AU - Tarantini, C.

AU - Craig, N.

AU - Polyanskii, A. A.

AU - Kametani, F.

AU - Hunte, F.

AU - Jaroszynski, J.

AU - Hellstrom, E. E.

AU - Larbalestier, D. C.

AU - Jin, R.

AU - Sefat, A. S.

AU - McGuire, M. A.

AU - Sales, B. C.

AU - Christen, D. K.

AU - Mandrus, D.

PY - 2008

Y1 - 2008

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AB - 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.

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Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO_0.89F_0.11 FeAs

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