{"paper":{"title":"Evidence for Nodal Superconductivity in LaFePO from Scanning SQUID Susceptometry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Ann S. Erickson, Clifford W. Hicks, Ian R. Fisher, James G. Analytis, Jiun-Haw Chu, Kathryn A. Moler, Martin E. Huber, Thomas M. Lippman","submitted_at":"2009-03-30T16:41:51Z","abstract_excerpt":"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, indicati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.5260","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}