Synthesis and microwave properties of thin films of the 1:2:2:1 borocarbide superconductors YNiBC and ErNiBC

Author

Andreone, A. ; Aruta, C. ; Iavarone, M. ; Palomba, F. ; Russo, M.L. ; Salluzzo, M. ; Vaglio, R. ; Cassinese, A. ; Hein, M.A. ; Kaiser, T. ; Mueller, G. ; Perpeet, M.

Author_Institution

Dipt. di Sci. Fisiche, Napoli Univ., Italy

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

2394

Lastpage

2397

Abstract

High-quality c-axis oriented YNi/sub 2/B/sub 2/C (transition temperature T/sub c/=15 K) and ErNi/sub 2/B/sub 2/C (T/sub c/=9.5 K) borocarbide superconducting thin films were grown "in-situ" on MgO and sapphire substrates by planar magnetron sputtering. Here we report data on the temperature, DC and RF magnetic field dependent surface impedance of the films and discuss them in view of possible applications. The YNi/sub 2/B/sub 2/C films displayed the behavior expected for BCS-like superconductors, while the microwave response of the antiferromagnetically ordering compound ErNi/sub 2/B/sub 2/C was distinctly different. The field dependent surface resistance of both types of films displayed granular effects.

Keywords

erbium compounds; high-frequency effects; nickel compounds; sputter deposition; superconducting thin films; superconducting transition temperature; surface conductivity; yttrium compounds; 15 K; 9.5 K; Al/sub 2/O/sub 3/; BCS-like superconductors; DC magnetic field dependence; ErNi/sub 2/B/sub 2/C; MgO; MgO substrate; RF magnetic field dependence; YNi/sub 2/B/sub 2/C; antiferromagnetically ordering compound; borocarbide superconductors; c-axis oriented thin film; granular effects; microwave properties; microwave response; planar magnetron sputtering; sapphire substrate; superconducting thin film; surface impedance; synthesis; temperature dependence; transition temperature; Magnetic films; Radio frequency; Sputtering; Superconducting films; Superconducting magnets; Superconducting thin films; Superconducting transition temperature; Surface resistance; Temperature dependence; Transistors;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784954

Filename

784954