| Literature DB >> 19392314 |
R T Gordon1, N Ni, C Martin, M A Tanatar, M D Vannette, H Kim, G D Samolyuk, J Schmalian, S Nandi, A Kreyssig, A I Goldman, J Q Yan, S L Bud'ko, P C Canfield, R Prozorov.
Abstract
The London penetration depth lambda(T) has been measured in single crystals of Ba(Fe0.93Co0.07)2As2. The observed low-temperature variation of lambda(T) follows a power law, Deltalambda(T) approximately T(n) with n approximately 2.4+/-0.1, indicating the existence of normal quasiparticles down to at least 0.02T(c). This is in contrast with previous penetration depth measurements on single crystals of NdFeAsO1-xFx and SmFeAsO1-xFx, which indicate an anisotropic but nodeless gap. We discuss possible explanations of the observed power law behavior.Entities:
Year: 2009 PMID： 19392314 DOI： 10.1103/PhysRevLett.102.127004
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161