Abstract
The vanadium and niobium nitrdes V x Nb1−x N are studied theoretically and experimentally for varying compositionsx. Self-consistent linear muffin-tin orbital band calculations are performed for various ordered supercells corresponding tox=0.0, 0.25, 0.50, 0.75, and 1.0. The band results are used to calculate electron-phonon coupling and spin susceptibility enhancement factors in order to study the variations of specific heat and superconducting transition temperatures with composition. A relative localization of, in particular, the V 3d states is found for the mixed compositions. The superconducting temperatures are found to be more reduced for intermediate compositions than what is expected from a simple interpolation between pure VN and NbN. Effects of spin fluctuations are important for the alloys containing vanadium, but are probably larger than what has been found in our theoretical study, and also containingq≠0 contributions. A small peak in the density of states near the Fermi energy is associated with a flat band near theW point, and causes a shoulder in density of state-dependent properties forx near 0.9.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
K. Schwarz,J. Phys. C 8, 809 (1975);10, 195 (1977).
A. Neckel, P. Rastl, R. Eibler, P. Weinberger, and K. Schwarz,J. Phys. C 9, 579 (1976).
D. Glötzel, R. W. Simpson, and H. R. Schober inPhysics of Transition Metals (Inst. Phys. Conf. Ser. No. 55, 1980), p. 567.
D. A. Papaconstantopoulos inPhysics of Transition Metals (Inst. Phys. Conf. Ser. No. 55, 1980), p. 563; B. M. Klein and D. A. Papaconstantopoulos,Phys. Rev. Lett. 32, 1193 (1974).
B. M. Klein and W. Pickett inProceedings of the IV Conference on Superconductivity in d-and f-Band Metals, W. Buckel and W. Weber, eds. (1982).
W. Weber,Phys. Rev. B 8, 5082 (1973).
H. Rietschel and H. Winter,Phys. Rev. Lett. 43, 1256 (1979); H. Rietschel, H. Winter, and W. Reichardt,Phys. Rev. B 22, 4284 (1980).
H. Rietschel,Phys. Rev. B 24, 155 (1981).
C. Geibel, Thesis, Universität Karlsruhe (1982), unpublished.
C. Geibel, H. Rietschel, A. Junod, M. Pelizzone, and J. Muller,J. Phys. F., to be published; M. Pelizzone, Thesis, University of Geneva (1982), unpublished.
Ö. Rapp and C. Crafoord,Phys. Stat. Sol. (b) 64, 139 (1974).
F. Heiniger,Phys. kondens. Materie. 5, 243 (1966).
O. K. Andersen,Phys. Rev. B 12, 3060 (1975).
T. Jarlborg and G. Arbman,J. Phys. F 6, 189 (1976);7, 1635 (1977); G. Arbman and T. Jarlborg,Solid State Commun. 26, 857 (1978).
T. Jarlborg,J. Phys. F 9, 283 (1979).
T. Jarlborg, A. A. Manuel, and M. Peter,Phys. Rev. 27, 4210 (1983).
T. Jarlborg, A. Junod, and M. Peter,Phys. Rev. 27, 1558 (1983).
J. Rath and A. J. Freeman,Phys. Rev. B 11, 2109 (1975); O. Jepsen and O. K. Andersen,Solid State Commun. 9, 1763 (1971); G. Lehmann and M. Taut,Phys. Stat. Sol. 54, 469 (1972).
D. D. Koelling and B. N. Harmon,J. Phys. C 10, 3107 (1975).
G. D. Gaspari and B. L. Gyorffy,Phys. Rev. Lett. 28, 801 (1972).
W. L. McMillan,Phys. Rev. 167, 331 (1968).
K. Bennemann and H. Garland inProceedings of the Conference on Superconductivity in d- and f-Band Metals, Rochester, 1971, D. H. Douglas, ed. (AIP, New York, 1972), p. 103.
T. Jarlborg and A. J. Freeman,Phys. Rev. B 22, 2332 (1980).
P. B. Allen and B. Mitrovic inSolid State Physics F. Seitz, D. Turnbull, and H. Ehrenreich, eds. (Academic Press, New York, 1982).
N. F. Berk and J. R. Schrieffer,Phys. Rev. Lett. 17, 433 (1966).
S. Doniach and S. Engelsberg,Phys. Rev. Lett. 17, 750 (1966).
T. P. Orlando and M. R. Beasley,Phys. Rev. Lett. 46, 1598 (1981).
J. M. Daams, B. Mitrovic, and J. P. Carbotte,Phys. Rev. Lett. 46, 65 (1981).
M. A. Jensen and K. Andres,Phys. Rev. 165, 545 (1968).
G. Riblet,Phys. Rev. B 3, 91 (1971).
F. I. Ajami and R. K. MacCrone,J. Phys. Chem. Solids 36, 5 (1975).
G. Horn and E. Saur,Z. Phys. 210, 70 (1968).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Dacorogna, M., Jarlborg, T., Junod, A. et al. Electronic structure and low-temperature properties of V x Nb1−x N alloys. J Low Temp Phys 57, 629–649 (1984). https://doi.org/10.1007/BF00683686
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00683686