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Doping evolution of the anisotropic upper critical fields in the iron-based superconductor Ba1-xKxFe2As2

TitleDoping evolution of the anisotropic upper critical fields in the iron-based superconductor Ba1-xKxFe2As2
Publication TypeJournal Article
Year of Publication2017
AuthorsTanatar, MA, Liu, Y, Jaroszynski, J, Brooks, JS, Lograsso, TA, Prozorov, R
JournalPhysical Review B
Volume96
Pagination184511
Date Published11
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000415086200005
Keywordshigh magnetic-fields, kfe2as2, limit, physics
Abstract

In-plane resistivity measurements as a function of temperature and magnetic field up to 35 T with precise orientation within the crystallographic ac plane were used to study the upper critical field H-c2 of the holedoped iron-based superconductor Ba1-xKxFe2As2. Compositions of the samples studied spanned from underdoped x = 0.17 (T-c = 12 K) and x = 0.22 (T-c = 20 K), both in the coexistence range of stripe magnetism and superconductivity, through optimal doping x = 0.39 (T-c = 38.4 K) and x = 0.47 (T-c = 37.2 K), to overdoped x = 0.65 (T-c = 22 K) and x = 0.83 (T-c = 10 K). We find notable doping asymmetry of the shapes of the anisotropic H-c2(T), suggesting the important role of paramagnetic limiting effects in the H parallel to a configuration in overdoped compositions and multiband effects in underdoped compositions.

DOI10.1103/PhysRevB.96.184511
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