Magnetic field splitting of the spin-resonance in CeCoIn5

Details Magnetic field splitting of the spin-resonance in CeCoIn5 Magnetic field splitting of the spin-resonance in CeCoIn5

2012-03-09

arxiv.org/abs/1203.2189v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

Neutron scattering in strong magnetic fields is used to show the spin-resonance in superconducting CeCoIn5 (Tc=2.3 K) is a doublet. The underdamped resonance (\hbar \Gamma=0.069 \pm 0.019 meV) Zeeman splits into two modes at E_{\pm}=\hbar \Omega_{0}\pm g\mu_{B} \mu_{0}H with g=0.96 \pm 0.05. A linear extrapolation of the lower peak reaches zero energy at 11.2 \pm 0.5 T, near the critical field for the incommensurate "Q-phase" indicating that the Q-phase is a bose condensate of spin excitons.

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