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J. Phys. Soc. Jpn. 78 (2009) 013708 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Limits on the Superconducting Order Parameter in NdFeAsO1-xFy from Scanning SQUID Microscopy

Clifford W. Hicks, Thomas M. Lippman, Martin E. Huber1, Zhi-An Ren2, Jie Yang2, Zhong-Xian Zhao2, and Kathryn A. Moler

Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, U.S.A.
1Departments of Physics and Electrical Engineering, University of Colorado Denver, Denver, CO 80217, U.S.A.
2National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, P.R. China

(Received August 7, 2008; Accepted November 14, 2008; Published December 25, 2008)

Identifying the symmetry of the superconducting order parameter in the recently-discovered ferro-oxypnictide family of superconductors, RFeAsO1-xFy, where R is a rare earth, is a high priority. Many of the proposed order parameters have internal π phase shifts, like the d-wave order found in the cuprates, which would result in direction-dependent phase shifts in tunnelling. In dense polycrystalline samples, these phase shifts in turn would result in spontaneous orbital currents and magnetization in the superconducting state. We perform scanning SQUID microscopy on a dense polycrystalline sample of NdFeAsO0.94F0.06 with Tc=48 K and find no such spontaneous currents, ruling out many of the proposed order parameters. ©2009 The Physical Society of Japan

KEYWORDS: ferro-oxypnictides, pnictides, scanning SQUID microscopy, order parameter, NdFeAsO
URL: http://jpsj.ipap.jp/link?JPSJ/78/013708/
DOI: 10.1143/JPSJ.78.013708


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