Document Detail

Evidence for a nodal energy gap in the iron-pnictide superconductor LaFePO from penetration depth measurements by scanning SQUID susceptometry.
MedLine Citation:
PMID:  19792454     Owner:  NLM     Status:  PubMed-not-MEDLINE    
We measure changes in the penetration depth lambda of the T_{c} approximately 6 K superconductor LaFePO. In the process, scanning SQUID susceptometry is demonstrated as a technique for accurately measuring local temperature-dependent changes in lambda, ideal for studying early or difficult-to-grow materials. lambda is found to vary linearly with temperatures from 0.36 to approximately 2 K, with a slope of 143 +/- 15 A/K, suggesting line nodes in the superconducting order parameter. The linear dependence up to approximately T_{c}/3, similar to the cuprate superconductors, indicates well-developed nodes.
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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Publication Detail:
Type:  Journal Article     Date:  2009-09-18
Journal Detail:
Title:  Physical review letters     Volume:  103     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-10-01     Completed Date:  2009-11-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  127003     Citation Subset:  -    
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California, 94305, USA.
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