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Comparative study of the effects of electron irradiation and natural disorder in single crystals of SrFe2(As1-xPx)(2) superconductor (x=0.35)

TitleComparative study of the effects of electron irradiation and natural disorder in single crystals of SrFe2(As1-xPx)(2) superconductor (x=0.35)
Publication TypeJournal Article
Year of Publication2014
AuthorsStrehlow, CP, Konczykowski, M, Murphy, JA, Teknowijoyo, S, Cho, K, Tanatar, MA, Kobayashi, T, Miyasaka, S, Tajima, S, Prozorov, R
JournalPhysical Review B
Volume90
Pagination020508
Date Published07
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000339990100001
Keywordsstate, symmetry, temperature penetration depth
Abstract

The London penetration depth lambda(T) was measured in single crystals of a SrFe2(As1-x P-x)(2) (x = 0.35) iron-based superconductor. The influence of disorder on the transition temperature T-c and on lambda(T) was investigated. The effects of scattering controlled by the annealing of as-grown crystals was compared with the effects of artificial disorder introduced by 2.5 MeV electron irradiation. The low-temperature behavior of lambda(T) can be described by a power-law function Delta lambda(T) = AT(n), with the exponent n close to one in pristine annealed samples, as expected for a superconducting gap with line nodes. Upon electron irradiation with a dose of 1.2 x 10(19) e/cm(2), the exponent n increases rapidly, exceeding a dirty limit value of n = 2, implying that the nodes in the superconducting gap are accidental and can be lifted by the disorder. The variation of the exponent n with T-c is much stronger in the irradiated crystals compared to the crystals in which disorder was controlled by the annealing of the growth defects. We discuss the results in terms of different influence of different types of disorder on intraband and interband scattering.

DOI10.1103/PhysRevB.90.020508
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