2011/12/02 by R. Sarkar, R Sarkar, R. Nath +9
Materials Science · Physics and Astronomy · #Antiferromagnetism #Atmospheric temperature range #Coherence length #Iron-based superconductors research #Magnetic field #Magnetism #NMR spectra database #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Relaxation (psychology) #Spectral line #Spin (aerodynamics) #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-8984/24/4/045702
published as J. Phys.: Condens. Matter 24 (2012) 045702
arxiv created 2011/12/02 · openalex publication_date 2012/01/03 · arxiv updated 2012/01/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We report bulk superconductivity (SC) in Eu(0.2)Sr(0.8)(Fe(0.86)Co(0.14))(2)As(2) single crystals by means of electrical resistivity, magnetic susceptibility and specific heat measurements with T(c) is approximately equal to 20 K and an antiferromagnetic (AFM) ordering of Eu(2+) moments at T(N) is approximately equal to 2.0 K in zero field. (75)As NMR experiments have been performed in the two external field directions (H is parallel to ab) and (H is parallel to c). (75)As-NMR spectra are analysed in terms of first-order quadrupolar interaction. Spin-lattice relaxation rates (1/T(1)) follow a T(3) law in the temperature range 4.2-15 K. There is no signature of a Hebel-Slichter coherence peak just below the SC transition, indicating a non-s-wave or s(±) type of superconductivity. In the temperature range 160-18 K 1/T(1)T follows the C/(T+θ) law reflecting 2D AFM spin fluctuations.