The normalized first-harmonic THz nonlinear response of MgB2 rises monotonically as temperature falls, fitting an overdamped π-band amplitude mode with damping rate 0.55 THz, about four times larger than in NbN.
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Amplitude mode in a multi-gap superconductor MgB$_2$ investigated by terahertz two-dimensional coherent spectroscopy
The normalized first-harmonic THz nonlinear response of MgB2 rises monotonically as temperature falls, fitting an overdamped π-band amplitude mode with damping rate 0.55 THz, about four times larger than in NbN.