Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry

Details Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry

2009-03-30

arxiv.org/abs/0903.5260v2

Phys. Rev. Lett. 103 (2009) 127003

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

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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