Aligned crystallite powder of NdFeAsO_0.86F_0.14: Magnetic hysteresis and penetration depth

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Yuri L. Zuev,¹ Eliot D. Specht,¹ Claudia Cantoni,¹ David K. Christen,¹ James R. Thompson,^1,2 Rongying Jin,¹ Athena S. Sefat,¹ David G. Mandrus,¹ Michael A. McGuire,¹ and Brian C. Sales¹
¹Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
²Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200, USA

Received 1 May 2009; revised 12 May 2009; published 19 June 2009

Wereport the basal-plane critical current and superfluid density of magneticallyaligned NdFeAsO_0.86F_0.14 powder. This sample has individual crystallite grains permanentlyoriented with their c axis along the external measuring field.Magnetic irreversibilities at high field suggest strong flux pinning ofbasal-plane critical currents, with monotonic field dependence and no evidenceof the “fishtail” effect. The small particles provide a sensitiveindicator of dc flux penetration and allow analysis of thetemperature dependence of ab-plane London penetration depth lambda _ab,L, which isquadratic at low T. This feature may not necessarily bedue to the nodes in the gap but may berather a sign of a strong pair breaking. A quantitativedetermination of the absolute magnitude of lambda _ab,L is hindered bythe need for accurate knowledge of the particle size distribution.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.79.224523
DOI:	10.1103/PhysRevB.79.224523
PACS:	74.70.Dd; 74.20.Rp; 74.25.Sv 74.70.Dd Superconducting ternary, quaternary and multinary compounds 74.20.Rp Pairing symmetries (other than s-wave) in superconductivity theory 74.25.Sv Critical currents in superconductors YEAR: 2009
KEYWORDS:	arsenic compounds, critical current density (superconductivity), crystallites, flux pinning, high-temperature superconductors, iron compounds, magnetic hysteresis, neodymium compounds, particle size, penetration depth (superconductivity)

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