Limits on the Superconducting Order Parameter in NdFeAsO$_{1-x}$F$_y$ from Scanning SQUID Microscopy

Details Limits on the Superconducting Order Parameter in NdFeAsO$_{1-x}$F$_y$ from Scanning SQUID Microscopy Limits on the Superconducting Order Parameter in NdFeAsO$_{1-x}$F$_y$ from Scanning SQUID Microscopy

2008-07-02

arxiv.org/abs/0807.0467v2

J. Phys. Soc. Jpn. 78 (2009) 013708

Physics

Condensed Matter

Superconductivity

10 pages, 5 figures; to appear in JPSJ

Scientific paper

10.1143/JPSJ.78.013708

Identifying the symmetry of the superconducting order parameter in the recently-discovered ferro-oxypnictide family of superconductors, RFeAsO$_{1-x}$F$_{y}$, where $R$ is a rare earth, is a high priority. Many of the proposed order parameters have internal $\pi$ 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 \NdFeAsO$_{0.94}$F$_{0.06}$ with $T_c=48$ K and find no such spontaneous currents, ruling out many of the proposed order parameters.

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