Temperature dependence of low-energy phonons in magnetic nonsuperconducting TbNi2B2C
S. Anissimova, A. Kreyssig, O. Stockert, M. Loewenhaupt, D. Reznik
TL;DR
This study investigates how low-energy phonons in magnetic TbNi2B2C change with temperature, revealing that magnetism, not weak electron-phonon coupling, prevents superconductivity.
Contribution
It provides the first detailed analysis of phonon behavior in magnetic TbNi2B2C, linking phonon softening to the absence of superconductivity due to magnetic pairbreaking.
Findings
Low-temperature phonon softening and broadening observed
Similar phonon behavior to superconducting RNi2B2C compounds
Magnetism likely causes pairbreaking, preventing superconductivity
Abstract
We report temperature dependence of low-energy phonons in magnetic nonsuperconducting TbNi2B2C single crystals measured by inelastic neutron scattering. We observed a low-temperature softening and broadening of two phonon branches, qualitatively similar to that previously reported for superconducting RNi2B2C (R= rare earth, Y) compounds. This result suggests that the superconductivity in TbNi2B2C compounds is absent not because of a weak electron-phonon coupling but as a result of pairbreaking due to magnetism.
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