%0 Journal Article
%A Bounds, R. W.
%A Pavarini, E.
%A Paolella, M.
%A Young, E.
%A Heinmaa, I.
%A Stern, R.
%A Carravetta, M.
%T Study of B 11 and C 13 NMR on doped MgB 2 in the normal and in the superconducting state
%J Physical review / B
%V 97
%N 1
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2019-01925
%P 014509
%D 2018
%X We have studied carbon-doped magnesium diboride nanoparticles using 13C and 11B NMR in the normal and superconducting states. Measurements of the line shape reveal the role of carbon as a flux-pinning center and, combined with Knight shift measurements, suggest the doping procedure favors the chemical substitution scenario. We perform ab initio calculations on a structure with a single carbon-boron substitution which yield results that match the experimental data. The 13C and 11B Knight shift data are used to extract the spin susceptibility, which indicates a BCS pairing mechanism; however, we do not observe the Hebel-Slichter coherence peak from 1/T1 data, which we hypothesize is due to a pair-breaking mechanism present in the boron planes.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000423114000005
%R 10.1103/PhysRevB.97.014509
%U https://juser.fz-juelich.de/record/861460