We have measured the real part of the surface impedance $R(H)$ of potassium at 1.2^∘{}K in a magnetic field normal to the sample surface. We find a sharp peak in $R(H)$ at the value of H where Cheng, Clarke, and Mermin predicted a new correlation-produced magnetoplasma mode should exist. We interpret the peak in $R(H)$ as confirmation of the existence of the mode, and we ascribe to surface roughness the overall variation in $R(H)$.
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Baraff et al. (1969) studied this question.
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