Abstract
A number of previously unreported A-15 Nb alloys have been studied, using samples prepared by dual target sputtering.T c was measured resistively and structure determined by x-ray diffraction. Samples were “chemically” analyzed by anodization. New alloys include A-15 Nb3Si and pseudobinary derivatives, as well as some derivatives of “Nb3P.”T c and the A-15 lattice parameter were surveyed for these, and for previously studied alloys related to Nb3Al, Nb3Ga, and Nb3Ge. The “chemical” variation ofT c was slight, except near pure Nb3Si and for alloys based upon “Nb3P,” where the samples show considerable disorder. Maxima inT c occur for the alloys Nb3Al0.7Ge0.3 and Nb3Al0.5Ga0.5. The first is well known; trends measured here indicate that the second may be equally high. It is proposed that the dominant factor forT c in this group of alloys is the state of order achieved in the samples. No evidence was seen to associate enhancedT c with A-15 phase boundaries.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
L. Y. L. Shen,Phys. Rev. Lett. 29, 1082 (1963).
J. D. Axe and G. Shirane,Phys. Rev. Lett. 30, 214 (1973).
F. J. Cadieu, L. F. Cooley, and D. H. Douglass,Rev. Sci. Instr. 42, 587 (1971).
D. K. Deardorff, R. E. Siemens, P. A. Romans, and R. A. McCune,J. Less-Common Metals 18, 11 (1969).
C. S. Barret and T. B. Massalski,Structure of Metals (McGraw-Hill, New York, 1966), 3rd ed.
F. J. Cadieu, inSuperconductivity in d- and f-Band Metals, D. H. Douglass, ed. (AIP, New York, 1972).
A. Müller,Z. Naturforsch. 25a, 1959 (1970).
B. T. Matthias, T. H. Geballe, R. H. Willens, E. Corenzwit, and G. W. Hull,Phys. Rev. 139A, 1501 (1965).
F. J. Cadieu, private communication.
C. Lundin and A. Yamamoto,Trans. AIME 236, 863 (1966).
G. W. Webb, inSuperconductivity in d- and f-Band Metals, D. H. Douglass, ed. (AIP, New York, 1972), p. 139.
R. H. Willens, T. H. Geballe, A. C. Gossard, J. P. Maita, A. Menth, G. W. Hull, Jr. and R. R. Soden,Solid State Commun. 7, 837 (1969).
B. T. Matthias, inThe Science and Technology of Superconductivity, W. D. Gregory, W. N. Mathews, Jr., and E. A. Edelsack, eds. (Plenum, New York, 1973), p. 274.
K. Schubert, H. G. Meissner, and W. Rossteutscher,Naturwiss. 51, 506 (1964).
R. H. Hammond and S. Hazra, inLow Temperature Physics LT-13 (Proc. 13th Int. Conf. Low Temp. Phys.) (Plenum, New York, 1963).
S. Geller,Acta Cryst. 9, 885 (1956).
G. R. Johnson and D. H. Douglass, preceding paper, this issue.
N. E. Alekseevskii, N. V. Ageev, and V. J. Shamrai,Inorganic Materials 2, 2156 (1966).
G. Arrhenius, E. Corenzwit, R. Fitzgerald, G. E. Hull, Jr., H. L. Luo, B. T. Matthias and W. H. Zachariasen,Proc. Nat. Acad. Sci. 61, 621 (1968).
G. Otto,Z. Physik 215, 324 (1968).
F. J. Cadieu,J. Low Temp. Phys. 3, 393 (1970).
J. J. Hanak, J. I. Gittleman, J. P. Pellicane and S. Bozowski,J. Appl. Phys. 41, 4958 (1970).
W. L. McMillan,Phys. Rev. 167, 331 (1968).
M. Strongin, inSuperconductivity in di- and f-Band Metals, D. H. Douglass, ed. (AIP, New York, 1972), p. 231.
J. Labbé and E. C. van Reuth,Phys. Rev. Lett. 24, 1232 (1970).
L. R. Testardi, in Physical Accoustics, Vol. X, W. P. Mason and R. N. Thurston, eds. (Academic Press, New York, 1973), p. 127.
P. B. Allen,Solid State Commun. 12, 379 (1973).
Author information
Authors and Affiliations
Additional information
This work was supported by NASA.
Rights and permissions
About this article
Cite this article
Johnson, G.R., Douglass, D.H. Superconductivity in new A-15 niobium alloys. J Low Temp Phys 14, 575–595 (1974). https://doi.org/10.1007/BF00658882
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00658882