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Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry

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arxiv 0903.5260 v2 pith:Z43Z4MGD submitted 2009-03-30 cond-mat.supr-con

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 This is my paper
classification cond-mat.supr-con
keywords lafepolambdachangesnodesscanningsquidsusceptometryaccurately
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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.

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