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We report a new methodology for synthesizing oxypnictide superconductors with the commonly available potassium fluoride (KF) as a source of fluorine instead of expensive LaF3. This results in simultaneous doping of potassium at lanthanum sites and leads to a three-fold increase in the upper critical field. We report the Tc (onset) of 28.50 K by F-doping and highest upper critical field (~122 T) at...
The authors reported out microwave surface impedance measurements of the optimally doped single crystal Ba(Fe1-xCox)2As2 (x=0.074) with critical temperature Tc=22.8K and found the power-law exponent 2.8 in temperature dependence of a field penetration depth. The obtained dependence is similar to however noticeably distinguished from radiofrequency range measurements. Thus, conclusion that nodal states...
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