Point Contact Spectroscopy Measurements of Ba(Fe0.96Co0.04)2As2 Single Crystals

P. Szabóa, J. Girovskýa, Z. Pribulováa, T. Samuelya, S.L. Bud'kob, P.C. Canfieldb and P. Samuelya aCentre of Low Temperature Physics, IEP Slovak Academy of Sciences & P.J. Šafárik University, Watsonova 47, SK-04353 Košice, Slovakia bAmes Laboratory and Iowa State University, Ames, IA 50011, USA

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Point contact spectroscopy results are presented on the electron underdoped Ba(Fe0.96Co0.04)2As2 single crystals. Two superconducting energy gaps with coupling values 2 Δp1 ∿ kTc ≈ 2.55 and 2 Δp2 ∿ kTc ≈ 11 at Tc = 15.5 K have been observed in the point contact spectra. The temperature dependence of the normal state background of the point contact spectra observed between Tc and TN indicates antiferromagnetic origin of the V-shaped minimum at zero bias.

DOI: 10.12693/APhysPolA.118.1045 PACS numbers: 74.50.+r, 74.70.Ad, 74.62.Dh