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Heat Capacity Measurements on Small Samples at Low Temperatures
1.C. N. King, H. C. Kirsch, and T. H. Geballe, Solid State Commun. 9, 907 (1971).
2.F. J. DiSalvo, R. E. Schwall, T. H. Geballe, F. R. Gamble, and J. H. Osiecki, Phys. Rev. Lett. 27, 310 (1971).
3.R. Bachmann, H. C. Kirsch, and T. H. Geballe, Rev. Sci. Instrum. 41, 547 (1970).
4.R. Bachmann, H. C. Kirsch, and T. H. Geballe, Solid State Commun. 9, 57 (1971).
5.F. J. Morin and J. P. Maita, Phys. Rev. 129, 1115 (1963).
6.P. F. Sullivan and G. Seidel, Phys. Rev. 173, 679 (1968).
6.See also P. Handler, D. E. Mapother, and M. Rayl, Phys. Rev. Lett. 19, 356 (1967).
7.California Fine Wire Co., P.O. Box 446, Grover City, Calif. 93433.
8.Wakefield Thermal Compound, No. 122, a white paste used to “heat sink” transistors has been used most successfully. We have also tried Cry‐Con Grease, Air Products and Chemicals, Inc., Allentown, Pa., a copper‐power‐loaded grease, but it seems to be unable to withstand the shock of cooling without cracking. Samples mounted with Cry‐Con (including copper metal) have fallen off.
9.A. C. Anderson, Rev. Sci. Instrum. 39, 605 (1968).
10.A. I. Dahl, Adv. Cryogen. Eng. 8, 544 (1963).
11.While it would not be difficult to regulate electronically, we have found it simpler to let the block come into equilibrium with the bath, as this gives sufficient stability.
12.W. F. Giauque, in The Scientific Papers of W. F. Giauque (Dover, New York, 1969), Vol. 1, p. 332.
12.Giauque refers to this type of calorimeter—more properly—as an “isothermal” design. At low temperatures, where the thermal link between sample and block is small, the heating of the sample is approximately adiabatic. An exhaustive discussion of the development of calorimetry is given by J. R. Partington, An Advanced Treatise on Physical Chemistry (Longmans Green, London, 1952), Vol. 3, Chap. M.
13.Partington, Ref. 12, pp. 417–420, describes a similar technique used by Ångstrom in 1861 to measure thermal conductivity.
14.Even when the sample thermal conductivity is high, there may still be effects due to poor thermal linking of sample to bolometer.
15.R. L. Greene, C. N. King, R. Zubeck, and T. H. Geballe.
16.K. N. Lee, R. Bachmann, T. H. Geballe, and J. P. Maita, Phys. Rev. B 2, 4580 (1970).
17.Model CR1000 CryoResistor, manufactured by CryoCal, Inc., 1371 Avenue E, Riviera Beach, Fla. 33404.
18.Sigmund Cohn, 121 S. Columbus Avenue, Mount Vernon, N.Y. 10553. Calibrations for gold‐iron vs copper may be found in R. L. Rosenbaum, Rev. Sci. Instrum. 39, 890 (1968);
18.R. L. Rosenbaum, 40, 577 (1969). A short sample of our gold‐iron wire was calibrated against a germanium thermometer lent us by Prof. N. E. Phillips of the University of California; this calibration confirmed Rosenbaum’s values to the stated accuracy of 0.05 K., Rev. Sci. Instrum.
19.D. W. Osborne, H. W. Flotow, and F. Schreiner [Rev. Sci. Instrum. 38, 159 (1967)] use this form to fit germanium resistance thermometer curves, using a 12‐parameter fitting routine.
20.R. C. Jones, J. Opt. Soc. Amer. 43, 1 (1953).
21.G. Ahlers, Rev. Sci. Instrum. 37, 477 (1966).
22.Cf. H S. Carslaw and J. C. Jaeger, Conduction of Heat in Solids, 2nd ed. (Oxford U.P., London, 1959), p. 128.
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