Anomalous Phonon Scattering Below Tc in YNi211B2C
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Inelastic neutron scattering measurements were performed on large volume (∼2 cm3) single crystals of 11B substituted intermetallic superconductor YNi211B2C. With decreasing temperature, a gradual softening of a phonon spectrum is observed at around Q = (0.525,0,8), similar to the case of LuNi2B2C reported by Dervenagas et al. [Phys. Rev. B 52, R9839 (1995)]. In addition, we discovered that an intense new peak appears below Tc = 14.2 K. With application of magnetic field, however, it is easily suppressed and disappears by H = Hc2 ( ∼4.7 T at T = 5.5 K). These results strongly indicate that this new peak is undoubtedly associated with its superconducting state.
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