|Title||Pressure-tuned superconductivity and normal-state behavior in Ba(Fe0.943Co0.057)(2)As-2 near the antiferromagnetic boundary|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Liu, W, Wu, YF, Li, XJ, Bud'ko, SL, Canfield, PC, Panagopoulos, C, Li, PG, Mu, G, Hu, T, Almasan, CC, Xiao, H|
|Journal||Physical Review B|
|Type of Article||Article|
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.
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