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  Magnetically driven superconductivity in CeCu(2)Si(2)

Stockert, O., Arndt, J., Faulhaber, E., Geibel, C., Jeevan, H. S., Kirchner, S., et al. (2011). Magnetically driven superconductivity in CeCu(2)Si(2). Nature Physics, 7(2), 119-124.

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 Creators:
Stockert, O., Author
Arndt, J., Author
Faulhaber, E., Author
Geibel, C., Author
Jeevan, H. S., Author
Kirchner, S.1, Author           
Loewenhaupt, M., Author
Schmalzl, K., Author
Schmidt, W., Author
Si, Q., Author
Steglich, F., Author
Affiliations:
1Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              

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 MPIPKS: YB 2012
 Abstract: The origin of unconventional superconductivity, including high-temperature and heavy-fermion superconductivity, is still a matter of controversy. Spin excitations instead of phonons are thought to be responsible for the formation of Cooper pairs. Using inelastic neutron scattering, we present the first in-depth study of the magnetic excitation spectrum in momentum and energy space in the superconducting and the normal states of CeCu(2)Si(2). A clear spin excitation gap is observed in the superconducting state. We determine a lowering of the magnetic exchange energy in the superconducting state, in an amount considerably larger than the superconducting condensation energy. Our findings identify the antiferromagnetic excitations as the main driving force for superconducting pairing in this prototypical heavy-fermion compound located near an antiferromagnetic quantum critical point.

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 Dates: 2011-02
 Publication Status: Issued
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 Identifiers: eDoc: 608337
ISI: 000286807000012
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Title: Nature Physics
Source Genre: Journal
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Pages: - Volume / Issue: 7 (2) Sequence Number: - Start / End Page: 119 - 124 Identifier: ISSN: 1745-2473