Upper critical field and electronic structure features of Ho(Y)Ba 2 Cu 3 O 7-x single-crystal films

1989 ◽  
Vol 162-164 ◽  
pp. 833-834
Author(s):  
E.V. Ekimov ◽  
A.I. Golovashkin ◽  
S.I. Krasnosvobodtsev ◽  
E.V. Pechen ◽  
N.P. Shabanova ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Single Crystal ◽  
Critical Field ◽  
Upper Critical Field ◽  
Single Crystal Films ◽  
Crystal Films

The effect of epitaxy on the upper critical fields of evaporated niobium films

1989 ◽  
Vol 4 (2) ◽  
pp. 283-287 ◽  
Author(s):  
Gin-ichiro Oya ◽  
Tetsuro Komukai ◽  
Yasuji Sawada
Keyword(s):  
Single Crystal ◽  
Critical Field ◽  
Surface Effect ◽  
Upper Critical Field ◽  
Critical Fields ◽  
Surface Nucleation ◽  
Single Crystal Films ◽  
Crystal Films ◽  
Upper Critical Fields ◽  
Niobium Suboxide

Two upper critical fields normal (Bc2⊥) and parallel (Bc2∥) to the surfaces of both single-crystal and polycrystalline Nb films are studied at 4.2 K in relation to the purity and morphology of the films, in order to make properties of the single-crystal films clear. High-quality single-crystal Nb films (with transition temperature Tc of ∼9.3 K and normal resistivity ρn of ∼0.2 μΩ · cm) are found to have magnetic properties characterized by Bc2⊥ of 0.31 T as low as Bc2 (bulk upper critical field) of bulk Nb, and Bc2∥/Bc2⊥ of ∼1.85 as high as Bc3/Bc2 (where Bc3 is the surface nucleation critical field) of pure Nb. These properties depend strongly on high purity and surface smoothness of the films, which is naturally accompanied by superconductivity. Polycrystalline Nb films have higher Bc2⊥ and lower Bc2∥/Bc2⊥, which result from a decrease in purity of the films and a presence of normal-conducting niobium-suboxide layers at the surfaces of the films, and thereby a decrease of the surface effect in the films.

Structure of Palladium Single-Crystal Films Prepared by Flash Evaporation onto (001) NaCl Substrates

1970 ◽  
Vol 28 ◽  
pp. 456-457
Author(s):  
L. E. Murr ◽  
G. Wong
Keyword(s):  
Single Crystal ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
High Rate ◽  
Flash Evaporation ◽  
Optimum Load ◽  
Single Crystal Films ◽  
Crystal Films ◽  
A Current

Palladium single-crystal films have been prepared by Matthews in ultra-high vacuum by evaporation onto (001) NaCl substrates cleaved in-situ, and maintained at ∼ 350° C. Murr has also produced large-grained and single-crystal Pd films by high-rate evaporation onto (001) NaCl air-cleaved substrates at 350°C. In the present work, very large (∼ 3cm2), continuous single-crystal films of Pd have been prepared by flash evaporation onto air-cleaved (001) NaCl substrates at temperatures at or below 250°C. Evaporation rates estimated to be ≧ 2000 Å/sec, were obtained by effectively short-circuiting 1 mil tungsten evaporation boats in a self-regulating system which maintained an optimum load current of approximately 90 amperes; corresponding to a current density through the boat of ∼ 4 × 104 amperes/cm2.

The P-H-T effects on the electric resistance and magnetoresistance of La0.7Sr0.1Pb0.2MnO3 single crystal films

2001 ◽  
Vol 27 (6) ◽  
pp. 451-453 ◽  
Author(s):  
S. S. Kucherenko ◽  
V. P. Pashchenko ◽  
P. I. Polyakov ◽  
S. I. Khartsev ◽  
V. A. Shtaba
Keyword(s):  
Single Crystal ◽  
Electric Resistance ◽  
Single Crystal Films ◽  
Crystal Films

Thermal stability of indium nitride single crystal films

1993 ◽  
Vol 73 (11) ◽  
pp. 7969-7971 ◽  
Author(s):  
Qixin Guo ◽  
Osamu Kato ◽  
Akira Yoshida
Keyword(s):  
Thermal Stability ◽  
Single Crystal ◽  
Indium Nitride ◽  
Single Crystal Films ◽  
Crystal Films ◽  
Thermal Stability Of
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