We report on the growth of superconducting Nb-doped thin films on substrates by pulsed laser deposition. We find optimum Nb doping and high mobility for growth near 870 °C and chamber pressures below Pa ( Torr). The transport properties were measured from 300 K to 150 mK. The most highly doped samples display metallic behavior, and are superconducting below 350 mK, with transition temperatures similar to those of bulk single crystals.
REFERENCES
1.
H. P. R.
Frederikse
, W. R.
Thurber
, and W. R.
Hosler
, Phys. Rev. A
134
, 442
(1964
).2.
M. Gurvitch, H. L. Stormer, R. C. Dynes, J. M. Graybeal, and D. C. Jacobsen, in Superconducting Materials: Proceedings of the 1986 Fall MRS Meeting, edited by J. Bevk and A. I. Braginski (Material Research Society, Pittsburgh, 1987), p. 47.
3.
Y.
Tokura
, Y.
Taguchi
, Y.
Okada
, Y.
Fujishima
, T.
Arima
, K.
Kumagai
, and Y.
Iye
, Phys. Rev. Lett.
70
, 2126
(1993
).4.
K. L. Myers, Ph.D. thesis, Stanford University, 1993 (unpublished).
5.
6.
H.
Suzuki
, H.
Bando
, Y.
Ootuka
, I. H.
Inoue
, T.
Yamamoto
, K.
Takahashi
, and Y.
Nishihara
, J. Phys. Soc. Jpn.
65
, 1529
(1996
).7.
J. F.
Schooley
, W. R.
Hosler
, E.
Ambler
, J. H.
Becker
, M. L.
Cohen
, and C. S.
Koonce
, Phys. Rev. Lett.
14
, 305
(1965
).8.
9.
J. K. Hulm, C. K. Jones, R. C. Miller, and T. Y. Tien, Proceedings of the 10th Conference on Low Temperature Physics, 1967 (unpublished), Vol. IIA, p. 86;
J. K.
Hulm
, M.
Ashkin
, D. W.
Deis
, and C. K.
Jones
, Prog. Low Temp. Phys.
6
, 205
(1970
).10.
A.
Yoshida
, H.
Tamura
, K.
Gotoh
, N.
Fujimaki
, S.
Hasuo
, D. K.
Chin
, and T.
Van Duzer
, Physica B
169
, 459
(1991
).11.
H.-M.
Christen
, J.
Mannhart
, E. J.
Willimas
, and Ch.
Gerber
, Phys. Rev. B
49
, 12095
(1994
).12.
B.
Mayer
, J.
Mannhart
, and H.
Hilgenkamp
, Appl. Phys. Lett.
68
, 3031
(1996
).13.
A.
Fujimori
, I.
Hase
, M.
Nakamura
, H.
Namatame
, Y.
Fujishima
, Y.
Tokura
, M.
Abbate
, F. M. F.
de Groot
, M. T.
Czyzyk
, J. C.
Fuggle
, O.
Strebel
, F.
Lopez
, M.
Domke
, and G.
Kaindl
, Phys. Rev. B
46
, 9841
(1992
).14.
15.
T.
Tomio
, H.
Miki
, H.
Tabata
, T.
Kawai
, and S.
Kawai
, J. Appl. Phys.
76
, 5886
(1994
).16.
Nb-doped strontium titanate single crystal targets were purchased from Commercial Crystal Laboratories, Inc., Naples, FL. Nb-doped STO is made by adding stoichiometric to stoichiometric The formula assumes that all of the extra O and Ti has segregated from the crystal during growth. Elemental analysis on the Nb-doping concentration was carried out by Charles Evans and Associates, Redwood City, CA, using proton induced x-ray emission.
17.
A.
Roshko
, F. J. B.
Stork
, D. A.
Rudman
, D. J.
Aldrich
, and P. A.
Morris Hotsenpiller
, J. Cryst. Growth
174
, 398
(1997
).18.
W.
Eidelloth
, W. J.
Gallager
, R. P.
Robertazzi
, R. H.
Koch
, B.
Oh
, and R. L.
Sandstrom
, Appl. Phys. Lett.
59
, 1257
(1991
).19.
20.
21.
22.
This content is only available via PDF.
© 1998 American Institute of Physics.
1998
American Institute of Physics
You do not currently have access to this content.
