Abstract
We report measurements of the angular dependence of the pressure derivatives of cross-sectional areas of the Fermi surface of Cs which vary from 2.67% kbar−1 for the minimum area cross section to 3.30% kbar−1 forH‖[[111]. This anisotropy invalidates the assumption of free-electron behavior in Cs used by Glinski and Templeton to arrive at a compressibility value for Cs which differed by −14% from that determined from the piston-cylinder measurements of Andersonet al. and by −8% from the ultrasonic result of Kollarits and Trivisonno. While a compressibility derived from our results is admittedly model dependent, we feel there is essentially no inconsistency between our compressibility and those derived by more conventional means.
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This work was supported by the U.S. Atomic Energy Commission.
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Beardsley, G.M., Schirber, J.E. Comment on the compressibility of Cs determined from pressure dependence of Fermi surface cross sections. J Low Temp Phys 8, 421–425 (1972). https://doi.org/10.1007/BF00653871
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DOI: https://doi.org/10.1007/BF00653871