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Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)(2)As-2 near the antiferromagnetic boundary

TitlePressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)(2)As-2 near the antiferromagnetic boundary
Publication TypeJournal Article
Year of Publication2018
AuthorsLiu, W, Wu, YF, Li, XJ, Bud'ko, SL, Canfield, PC, Panagopoulos, C, Li, PG, Mu, G, Hu, T, Almasan, CC, Xiao, H
JournalPhysical Review B
Volume97
Pagination144515
Date Published04
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000430544600005
Keywordsphysics
Abstract

Superconductivity in iron pnictides is unconventional and pairing may be mediated by magnetic fluctuations in the Fe sublattice. Pressure is a clean method to explore superconductivity in iron based superconductors by tuning the ground state continuously without introducing disorder. Here we present a systematic high pressure transport study in Ba(Fe1-xCox)(2)As-2 single crystals with x = 0.057, which is near the antiferromagnetic instability. Resistivity rho = rho(0) + AT(n) was studied under applied pressure up to 7.90 GPa. The parameter n approaches a minimum value of n approximate to 1 at a critical pressure P-c = 3.65 GPa. Near P-c, the superconducting transition temperature T-c reaches a maximum value of 25.8 K. In addition, the superconducting diamagnetism at 2 K shows a sudden change around the same critical pressure. These results may be associated with a possible quantum critical point hidden inside the superconducting dome, near optimum T-c.

DOI10.1103/PhysRevB.97.144515
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