Abstract
A theory is presented explaining the recently observed superconductivity at 9 °K in Pd-H and at 11 °K in Pd-D as due to the quenching of the spin-fluctuations and as due to the decrease of the Coulomb pseudo-potential μ present in Pd. That one observes for PdD a larger superconducting transition temperatureT c than for PdH is explained by the larger lattice expansion resulting for adding H to Pd. The observed non-monotonic dependence ofT c on the Hydrogen concentration is explained by the fact that approximately λ ∝N(0) for smallN(0), whereN(0) is the electronic density of states at the Fermi-energy and where λ denotes the electron-phonon coupling constant. Superconducting transition temperatures are estimated for PtH and RhH.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Lewis, F. A.: In: The palladium-hydrogen system. New York: Academic Press 1967.
Eastman, D. E., Cashion, J. K., Switendick, A. C.: Phys. Rev. Letters27, 35 (1971).
Mackliet, C. A., Schindler, A. I.: Phys. Rev.146, 463 (1966).
See Ref. [1] p. 148.
Stritzker, B., Buckel, W.: Z. Physik, to be published.
Skoskiewicz, T.: Phys. stat. sol.11, K123 (1972), observed superconductivity in PdH at about 4 °K for 87 at% H.
Doniach, S.: Proc. Manchester Many Body Conf., Sept., 1964 (unpublished).
Berk, N. F., Schrieffer, J. R.: Phys. Rev. Letters17, 433 (1966).
McMillan, W. L.: Phys. Rev.167, 331 (1967).
Switendick, A. C.: Solid State Commun.8, 1463 (1970).
Bennemann, K. H., Garland, J. W.: In: Superconductivity ind- andf-Band Metals, ed. by D. H. Douglass. AIP Conference Proceedings, No. 4, 1972.
Gladstone, G., Jensen, M. A., Schrieffer, J. R.: Superconductivity, vol. 2, p. 665, ed. R. D. Parks. New York: Marcel Dekker, Inc. 1969.
From specific heat experiments, see Refs. [3, 10] and from energy-band calculations, see, for example, Mueller, F. M., Freeman, A. J., Dimmock, J. O., Furdyna, A. M.: Phys. Rev. B1, 4617 (1970), one finds μspin+λ∼0.8 for Pd. A is estimated to be of the order of 0.4. Hence, μspin should be of the order of 0.4 which seems reasonable, since UN(0)∼ 0.85.
Hopfield, J.: Phys. Rev.186, 443 (1969).
Levin, K., Bass, R., Bennemann, K. H.: Phys. Rev. B6, 1865 (1972).
Mueller, F. M.,et. al.: Ann. Phys. (N.Y.)67, 19 (1971).
Anderson, O. K., Macintosh, A.: Sol. State Commun.6, 285 (1968).
Hodges, L., Ehrenreich, H., Lang, N. D.: Phys. Rev.152, 505 (1966).
Elliot, R. P.: Constitution of binary alloys. New York: McGraw-Hill 1965.
Wicke, E., Otto, K.: Z. Phys. Chem. (Neue Folge),31, 222 (1972).
Sieverts, A., Danz, W.: Z. Physik Chem. B34, 159 (1936);38, 70 (1938).
Ubbelohde, A. R.: Proc. Roy. Soc. A159, 307 (1937).
Barisic, S., Labbé, J., Friedel, J.: Phys. Rev. Letters25, 919 (1970).
Author information
Authors and Affiliations
Additional information
Partly supported by US Atomic Energy Commission.
We thank Profs. H. Claus, W. Buckel, and J. Mydosh, and Drs. D. Koellmg and B. Stritzker for useful discussions.
Rights and permissions
About this article
Cite this article
Bennemann, K.H., Garland, J.W. Theory for superconductivity in Pd-H and Pd-D systems. Z. Physik 260, 367–374 (1973). https://doi.org/10.1007/BF01397961
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF01397961