Limits on the Superconducting Order Parameter in NdFeAsO_<1-x>F_y from Scanning SQUID Microscopy(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• Identifying the symmetry of the superconducting order parameter in the recently-discovered ferrooxypnictide 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 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 NdFeAsO_<0.94>F_<0.06> with T_c=48K and find no such spontaneous currents, ruling out many of the proposed order parameters.

• 2009-01-15

著者

• Ren Zhi-an

  National Laboratory For Superconductivity Institute Of Physics And Beijing National Laboratory For C

• HICKS Clifford

  Geballe Laboratory for Advanced Materials, Stanford University

• LIPPMAN Thomas

  Geballe Laboratory for Advanced Materials, Stanford University

• HUBER Martin

  Department of Physics and Electrical Engineering, University of Colorado Denver

• YANG Jie

  National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for

• ZHAO Zhong-Xian

  National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for

• MOLER Kathryn

  Geballe Laboratory for Advanced Materials, Stanford University

• Yang Jie

  National Laboratory For Superconductivity Institute Of Physics And Beijing National Laboratory For C

• Huber Martin

  Department Of Physics And Electrical Engineering University Of Colorado Denver

• Moler Kathryn

  Geballe Laboratory For Advanced Materials Stanford University

• Hicks Clifford

  Geballe Laboratory For Advanced Materials Stanford University

• Lippman Thomas

  Geballe Laboratory For Advanced Materials Stanford University

• Zhao Zhong-xian

  National Laboratory For Superconductivity Institute Of Physics And Beijing National Laboratory For C

関連論文

• Limits on the Superconducting Order Parameter in NdFeAsO_F_y from Scanning SQUID Microscopy(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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