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Nature of the Spin Resonance Mode in CeCoIn5



Yu Song, Weiyi Wang, John S. Van Dyke, Naveen Pouse, Sheng Ran, Duygu Yazici, Astrid Schneidewind, Petr Cermak, Yiming Qiu, M. B. Maple, Dirk K. Morr, Pengcheng Dai


Complex intertwined orders often emerge in strongly correlated electron materials in the vicinity of unconventional superconductivity. Superconductivity is typically optimized when such orders are suppressed, although associated fluctuations remain intense and possibly bind Cooper pairs. In the d-wave superconductor CeCoIn5, we use inelastic neutron scattering to identify two components in the magnetic fluctuation spectrum with qualitatively different structures in momentum space and behaviors under applied magnetic field. One component is centered at incommensurate wave vectors Q = (0.5 ±δ, 0.5 ±δ, 0.5) and condenses into magnetic Bragg peaks in the so-called Q phase the commensurate wave vectorQ = (0.5, 0.5, 0.5) and splits into a doublet under applied magnetic field. Both components are present at low energies just above the superconductivity-induced spin gap, and the overlap results in a smaller apparent splitting δ compared to magnetic order upon insertion of a small concentration of Nd impurities. The magnetic fluctuation spectrum with two components in CeCoIn5 is reminiscent of those in copper oxide superconductors and suggest similar mechanisms for d-wave superconductivity in the two systems.
Communications Physics


superconductivity, magnetic excitations, neutron scattering


Song, Y. , Wang, W. , Van Dyke, J. , Pouse, N. , Ran, S. , Yazici, D. , Schneidewind, A. , Cermak, P. , Qiu, Y. , Maple, M. , Morr, D. and Dai, P. (2020), Nature of the Spin Resonance Mode in CeCoIn<sub>5</sub>, Communications Physics, [online], (Accessed June 9, 2023)
Created May 28, 2020, Updated October 12, 2021