Low-temperature compressibilities and absolute de Haas-van Alphen frequencies in potassium, rubidium, and cesium

Abstract

The absolute de Haas-van Alphen (dH-vA) frequencies and the scaling effect of small hydrostatic pressures on extremal cross sections of the Fermi surface have been measured in freely mounted samples of K, Rb, and Cs. The dH-vA frequencies are in good agreement with those derived from currently accepted values for the low-temperature lattice constants of the three metals at (1.824±0.002), (1.603±0.003), and (1.365±0.002)×108 G, respectively. The low-temperature compressibilities derived from the pressure measurements at (2.577±0.013), (3.644±0.015), and (4.020±0.02)×10−2 kbar−1, respectively, show discrepancies of −5, −8, and −14% with those measured by more conventional techniques. The characteristic energyB0V0 (bulk modulus × atomic volume) is found to be constant at about 1.67×105 J/mole in the three metals.