TY  - JOUR
AU  - Bounds, R. W.
AU  - Pavarini, E.
AU  - Paolella, M.
AU  - Young, E.
AU  - Heinmaa, I.
AU  - Stern, R.
AU  - Carravetta, M.
TI  - Study of B 11 and C 13 NMR on doped MgB 2 in the normal and in the superconducting state
JO  - Physical review / B
VL  - 97
IS  - 1
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2019-01925
SP  - 014509
PY  - 2018
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000423114000005
DO  - DOI:10.1103/PhysRevB.97.014509
UR  - https://juser.fz-juelich.de/record/861460
ER  -