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Phys. Rev. B 78, 064511 (2008) [5 pages]

Comparative high-field magnetotransport of the oxypnictide superconductors RFeAsO1−xFx (R=La, Nd) and SmFeAsO1−δ

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J. Jaroszynski, Scott C. Riggs, F. Hunte, A. Gurevich, D. C. Larbalestier, and G. S. Boebinger
National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA

F. F. Balakirev and Albert Migliori
National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Z. A. Ren, W. Lu, J. Yang, X. L. Shen, X. L. Dong, and Z. X. Zhao
National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, People’s Republic of China

R. Jin, A. S. Sefat, M. A. McGuire, B. C. Sales, D. K. Christen, and D. Mandrus
Materials Science Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831, USA

Received 13 June 2008; revised 17 July 2008; published 12 August 2008

We compare magnetotransport of the three iron-arsenide-based compounds ReFeAsO (Re=La, Sm, Nd) in very high DC and pulsed magnetic fields up to 45 and 54 T, respectively. Each sample studied exhibits a superconducting transition temperature near the maximum reported to date for that particular compound. While high magnetic fields do not suppress the superconducting state appreciably, the resistivity, Hall coefficient, and critical magnetic fields, taken together, suggest that the phenomenology and superconducting parameters of the oxypnictide superconductors bridges the gap between MgB2 and YBCO.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.064511
DOI:
10.1103/PhysRevB.78.064511
PACS:
74.70.−b, 74.25.Fy, 74.72.−h, 74.81.Bd
 
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