Abstract
The hydrostatic pressure dependence of cyclotron effective mass of potassium up to 4.4 kbar in solid helium was obtained from de Haas-van Alphen measurements using the field modulation technique. The logarithmic pressure derivative of the cyclotron effective mass was found to be -(0.71+or-0.12)*10-2 kbar-1 and the zero-pressure mass was (1.211+or-0.005)m0, where m0 is the free-electron mass. The decrease of the quasiparticle mass with increasing pressure is compared with theoretical predictions of the changes of band mass, electron-electron and electron-phonon mass enhancement parameters with pressure.
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