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Study of 11B and 13C NMR on doped MgB2 in the normal and in the superconducting state

Study of 11B and 13C NMR on doped MgB2 in the normal and in the superconducting state
Study of 11B and 13C NMR on doped MgB2 in the normal and in the superconducting state
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.
2469-9969
Bounds, R.
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Pavarini, E.
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Paolella, M.
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Young, E
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Heinmaa, I.
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Stern, R.
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Carravetta, M.
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Bounds, R.
3f108fd4-8375-4d0d-8718-e8be7a0ef7f7
Pavarini, E.
018f0e85-fac7-4c06-bea4-ae981141a64e
Paolella, M.
80a48257-0a52-4695-bf2b-7b7948527d21
Young, E
f3d1b8da-af31-4f9d-a932-f3de15d4c687
Heinmaa, I.
8322a7ff-3d43-451b-a016-db894a91594e
Stern, R.
436582c6-8118-46b6-be62-113c1db4d40b
Carravetta, M.
1b12fa96-4a6a-4689-ab3b-ccc68f1d7691

Bounds, R., Pavarini, E., Paolella, M., Young, E, Heinmaa, I., Stern, R. and Carravetta, M. (2018) Study of 11B and 13C NMR on doped MgB2 in the normal and in the superconducting state Physical Review B, 97, (1) (doi:10.1103/PhysRevB.97.014509).

Record type: Article

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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Submitted date: 15 June 2017
Accepted/In Press date: 12 September 2017
e-pub ahead of print date: 16 January 2018

Identifiers

Local EPrints ID: 417185
URI: https://eprints.soton.ac.uk/id/eprint/417185
ISSN: 2469-9969
PURE UUID: 049d63ac-220d-4b5a-992e-5c6bfa8899a8

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Date deposited: 24 Jan 2018 17:30
Last modified: 03 Feb 2018 17:30

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Contributors

Author: R. Bounds
Author: E. Pavarini
Author: M. Paolella
Author: E Young
Author: I. Heinmaa
Author: R. Stern
Author: M. Carravetta

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