2011/06/30 by Hideyuki Takahashi, Yoshinori Imai, Seiki Komiya +3 · 40 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Condensed matter physics #Corporate Taxation and Avoidance #Crossover #Exponent #Iron-based superconductors research #Lambda #London penetration depth #Pairing #Penetration depth #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Scattering #Superconductivity #Superfluidity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.84.132503
published in Physical Review B 84(13) (American Physical Society) · 4 pages, 4 figures
arxiv created 2011/09/16 · openalex publication_date 2011/10/18 · arxiv updated 2011/11/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report microwave surface impedances of FeSe0.4Te0.6 single crystals measured at 12, 19, and 44 GHz. The penetration depth exhibits a power-law behavior, \ensuremathδ\ensuremathλL=\ensuremathλL(T)\ensuremath-\ensuremathλL(0)\ensuremath∝CTn with an exponent n\ensuremath≃2, which is considered to result from impurity scattering. The temperature dependence of the superfluid density largely deviates from the behavior expected in the BCS theory. We believe that this deviation is caused by the crossover from the dirty regime near Tc to the clean regime at low temperatures, which is supported by the rapid increase of the quasiparticle scattering time obtained from the microwave conductivity. We also believe that the previously published data of the superfluid density can be interpreted in this scenario.