The microwave surface resistance of potassium in a perpendicular magnetic field, measured by Baraff, Grimes, and Platzman in 1969, has never been completely explained until now. The sharp cyclotron resonance peak (at a magnetic field (Formula presented)) is caused by the small cylindrical section of Fermi surface created by the charge-density-wave (CDW) minigaps, having periodicities K(Formula presented)=(n+1)Q→-(Formula presented). The shape of the observed resonance requires a tilt of the CDW vector Q→ away from , predicted by Giuliani and Overhauser in 1979. An abrupt drop of the surface resistance for |H|≳|(Formula presented)| is caused by the heterodyne gaps, which have periodicities K(Formula presented)=n(G(Formula presented)-Q→). These very small gaps, which begin to undergo magnetic breakdown for fields H≳1 T, interrupt the cyclotron motion of equatorial orbits. The abrupt drop in surface resistance for |H|≳|(Formula presented)| is caused by the resulting partial loss of carrier effectiveness for electrons having velocities nearly parallel to the surface.
|Original language||English (US)|
|Number of pages||13|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1996|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics