Magnetically driven superconductivity in CeCu2Si2

Details Magnetically driven superconductivity in CeCu2Si2 Magnetically driven superconductivity in CeCu2Si2

2012-02-18

arxiv.org/abs/1202.4112v1

Nature Physics, vol. 7, p. 119 (2011)

Physics

Condensed Matter

Superconductivity

30 pages, including supplementary material

Scientific paper

10.1038/NPHYS1852

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 CeCu2Si2. 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 major driving force for superconducting pairing in this prototypical heavy-fermion compound located near an antiferromagnetic quantum critical point.

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