Superconducting and normal conducting characteristics of (Y/sub x/Pr/sub 1-x/)Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin films

Author

Miyazaki, R. ; Okabe, Y.

Author_Institution

Res. Center for Adv. Sci. & Technol., Tokyo Univ., Japan

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1649

Lastpage

1652

Abstract

The ratio of Yttrium (Y) to Praseodymium (Pr) is varied in (Y/sub x/Pr/sub 1-x/)Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YPBCO) thin films to consider the relation between superconducting YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) and insulating PrBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (PBCO) thin films. The critical temperature (T/sub c/) of the superconducting YPBCO thin film is decreased by substituting more Pr in place of Y, because Pr reduces the carrier density on the CuO/sub 2/ plane in YPBCO. The electrical characteristic of the YBCO film can be explained by the weakly coupled chain model. The addition of Pr reinforces the superconducting links among the grains in the YPBCO thin film. The normal state YPBCO film-shows two types of transport systems. Behavior similar to impurity semiconductors appears at high temperatures and the variable range hopping mechanism governs their conductance at low temperatures.<>

Keywords

barium compounds; carrier density; high-temperature superconductors; hopping conduction; praseodymium compounds; superconducting thin films; superconducting transition temperature; yttrium compounds; (Y/sub x/Pr/sub 1-x/)Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin films; YPrBa/sub 2/Cu/sub 3/O/sub 7/; carrier density; conductance; critical temperature; electrical characteristic; impurity semiconductors; normal state; substitution; superconducting links; transport; variable range hopping; weakly coupled chain model; Charge carrier density; Electric variables; High temperature superconductors; Insulation; Semiconductor films; Semiconductor thin films; Superconducting films; Superconducting thin films; Temperature distribution; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402892

Filename

402892