Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry

Clifford W. Hicks; Thomas M. Lippman; Martin E. Huber; James G. Analytis; Jiun-Haw Chu; Ann S. Erickson; Ian R. Fisher; Kathryn A. Moler

doi:10.1103/PhysRevLett.103.127003

Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry

Superconductivity 2013-05-29 v2

Authors: Clifford W. Hicks , Thomas M. Lippman , Martin E. Huber , James G. Analytis , Jiun-Haw Chu , Ann S. Erickson , Ian R. Fisher , Kathryn A. Moler

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Abstract

We measure changes in the penetration depth $\lambda$ of the $T_c \approx 6$ K superconductor LaFePO. In the process scanning SQUID susceptometry is demonstrated as a technique for accurately measuring {\it local} temperature-dependent changes in $\lambda$ , making it ideal for studying early or difficult-to-grow materials. $\lambda$ of LaFePO is found to vary linearly with temperature from 0.36 to $\sim$ 2 K, with a slope of 143 $\pm$ 15 \AA/K, suggesting line nodes in the superconducting order parameter. The linear dependence up to $\sim T_c/3$ is similar to the cuprate superconductors, indicating well-developed nodes.

Keywords

LaFePO nodal superconductivity penetration depth scanning SQUID susceptometry line nodes iron-based superconductors

Cite

@article{arxiv.0903.5260,
  title  = {Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry},
  author = {Clifford W. Hicks and Thomas M. Lippman and Martin E. Huber and James G. Analytis and Jiun-Haw Chu and Ann S. Erickson and Ian R. Fisher and Kathryn A. Moler},
  journal= {arXiv preprint arXiv:0903.5260},
  year   = {2013}
}

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4 pages, 5 figures

Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry

Abstract

Keywords

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