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Ising Incommensurate Spin Resonance of CeCoIn5: A Dynamical Precursor of the Q Phase

Stéphane Raymond 1 Gerard Lapertot 2 
1 MDN - Magnétisme et Diffusion Neutronique
MEM - Modélisation et Exploration des Matériaux : DRF/IRIG/MEM
2 IMAPEC - Instrumentation, Material and Correlated Electrons Physics
PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS : DRF/IRIG/PHELIQS
Abstract : It is shown through detailed inelastic neutron scattering experiments that the gapped collective magnetic excitation of the unconventional superconductor CeCoIn5, the spin resonance mode, is incommensurate and that the corresponding fluctuations are of an Ising nature. The incommensurate peak position of these fluctuations corresponds to the propagation vector of the adjacent field induced static magnetic ordered phase, the so-called Q phase. Furthermore, the direction of the magnetic moment fluctuations is also the direction of the ordered magnetic moments of the Q phase. Hence, the resonance mode and the Q phase share the same symmetry and this strongly supports a scenario where the static order is realized by a condensation of the magnetic excitation.
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Submitted on : Thursday, March 15, 2018 - 2:57:53 PM
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Stéphane Raymond, Gerard Lapertot. Ising Incommensurate Spin Resonance of CeCoIn5: A Dynamical Precursor of the Q Phase. Physical Review Letters, American Physical Society, 2015, 115 (3), pp.037001. ⟨10.1103/PhysRevLett.115.037001⟩. ⟨cea-01735137⟩



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