TY - JOUR
T1 - NMR studies on iron pnictide superconductors of LaFeAsO 0.89F0.11 and Ca-Fe-Pt-As
AU - Kobayashi, Y.
AU - Iida, T.
AU - Suzuki, K.
AU - Satomi, E.
AU - Kawamata, T.
AU - Itoh, M.
AU - Sato, M.
PY - 2012/1/1
Y1 - 2012/1/1
N2 - We first show results of (NMR-1/T1)-T curves of LaFeAsO 1-xFx samples with various x values. It does not have the coherence peak and absolute values of dlog(1/T1)/d log(T/T c) shows the dome shaped x dependence with a maximum at the optimum x value. Considering the T dependent energy broadening of quasi-particles and magnetic susceptibility below Tc, we show that the nonexistence of the coherence peak cannot necessarily be regarded as the evidence for the S ± symmetry of the order parameter. We also present NMR data on the superconducting Ca-Fe-Pt-As system recently found by Kakiya et al. 75As-NMR spectra taken for single crystals of the system indicate clear evidence that Pt atoms are doped into the FeAs conducting layers consistently with the results of the structure analyses, indicating that the superconductivity survives even in the existence of strong impurity scattering of the conduction electrons.
AB - We first show results of (NMR-1/T1)-T curves of LaFeAsO 1-xFx samples with various x values. It does not have the coherence peak and absolute values of dlog(1/T1)/d log(T/T c) shows the dome shaped x dependence with a maximum at the optimum x value. Considering the T dependent energy broadening of quasi-particles and magnetic susceptibility below Tc, we show that the nonexistence of the coherence peak cannot necessarily be regarded as the evidence for the S ± symmetry of the order parameter. We also present NMR data on the superconducting Ca-Fe-Pt-As system recently found by Kakiya et al. 75As-NMR spectra taken for single crystals of the system indicate clear evidence that Pt atoms are doped into the FeAs conducting layers consistently with the results of the structure analyses, indicating that the superconductivity survives even in the existence of strong impurity scattering of the conduction electrons.
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U2 - 10.1088/1742-6596/400/2/022056
DO - 10.1088/1742-6596/400/2/022056
M3 - Conference article
AN - SCOPUS:84873660277
VL - 400
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - PART 2
M1 - 022056
T2 - 26th International Conference on Low Temperature Physics, LT 2011
Y2 - 10 August 2011 through 17 August 2011
ER -