Journal Article

FZJ-2019-01925

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Study of B 11 and C 13 NMR on doped MgB 2 in the normal and in the superconducting state

Bounds, R. W. ; Pavarini, E. (Corresponding author)FZJ* ; Paolella, M. ; Young, E. ; Heinmaa, I. ; Stern, R. ; Carravetta, M.

2018
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/22726  doi:10.1103/PhysRevB.97.014509

Abstract: 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.

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Contributing Institute(s):

1. Theoretische Nanoelektronik (IAS-3)
2. JARA - HPC (JARA-HPC)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)
2. Spin-orbital order-disorder transitions in strongly correlated systems (jiff46_20161101) (jiff46_20161101)
3. Multiplet effects in strongly correlated materials (jiff41_20091101) (jiff41_20091101)
4. Multiplet effects in strongly correlated materials (jara0050_20130501) (jara0050_20130501)

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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