Zeeman Splitting of the Resonance Mode in CeCoIn5
In the Q-phase of unconventional superconductor CeCoIn5, static spin-density-wave magnetic order (SDW) is formed at high magnetic field inside the boundaries of the superconducting dome. It is argued that the Q-phase represents the condensation of a "neutron spin resonance mode" (SRM) that is generated from quasiparticles at the nodes of the primary dx2-y2 superconducting gap. With samples oriented in the HHL scattering plane, a vertical magnetic field generates all four of the Q-phase SDW Bragg peaks in the horizontal scattering plane, thus the SRM has been previously studied with neutron scattering, where a doublet Zeeman splitting was observed. However, in principle the dx2-y2 gap symmetry allows four additional SRM positions outside the horizontal scattering plane. While it is known that no Q-phase forms at these positions, no studies have been conducted to determine the fate of the SRM. Armed with very large samples, we will use IN5 to measure the SRM simultaneously at the in-plane and out-of-plane positions, to determine whether the splitting of the SRM can explain the microscopic mechanism for why the Q-phase does not appear at these out-of-plane positions.
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David W. Tam; KENZELMANN Michel; OLLIVIER Jacques and RAYMOND Stephane. (2021). Zeeman Splitting of the Resonance Mode in CeCoIn5. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-598
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