2013/08/02 by J. A. Murphy, J. Murphy, M. A. Tanatar +10 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #Condensed matter physics #Crystallography #Doping #Exponent #Heavy ion #Ion #Iron-based superconductors research #Irradiation #London penetration depth #Materials science #Nuclear physics #Optics #Penetration depth #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.88.054514
arxiv created 2013/08/02 · openalex publication_date 2013/08/27 · arxiv updated 2015/06/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Irradiation with 1.4 GeV 208Pb ions was used to induce artificial disorder in single crystals of iron-arsenide superconductor Ba(Fe_1\ensuremath-xCox)2As2 and to study its effects on the temperature-dependent London penetration depth and transport properties. A study was undertaken on overdoped single crystals with x=0.108 and x=0.127 characterized by notable modulation of the superconducting gap. Irradiation corresponding to the matching fields of B_\ensuremathφ=6 T and 6.5 T with doses 2.22\ifmmode×\else\texttimes\fi1011 d/cm2 and 2.4\ifmmode×\else\texttimes\fi1011 d/cm2, respectively, suppresses the superconducting Tc by approximately 0.3 to 1 K. The variation of the low-temperature penetration depth in both pristine and irradiated samples is well described by the power law \ensuremathΔ\ensuremathλ(T)=ATn. Irradiation increases the magnitude of the prefactor A and decreases the exponent n, similar to the effect of irradiation in optimally-doped samples. This finding supports universal s_\ifmmode±\else\textpm\fi pairing in Ba(Fe_1\ensuremath-xCox)2As2 compounds for the entire Co doping range.