HEAT CAPACITY OF COPPER-GERMANIUM ALLOYS BELOW 4.2 K

摘要: Heat capacity measurements below 4.2 deg K have been made on a series of alloys in the primary phase copper-- germanium system. When corrected for lattice expansion, resulting change electronic speccific heat electron/atom ratios is found to be same as that zinc In neither case variation consistent with than expected parabolic valence band, thereby lending,; support previously advanced hypothesis Fermi surface copper departs appreciably from sphericity. Both systems exhibit Debye temperarure electron concentration, when appropriate corrections are differences atomic mass and volume two alloy series. This supports idea elastic constants these influenced principally by proximity boundaries first Brillouin zone. The solute deduced thc present work, compared obtained ultrasonic pulse at room temperature. (auth)