Effects of Neutron Irradiation on Magnesium Diboride Thin Films

Author

Ferrando, V. ; Pallecchi, I. ; Tarantini, C. ; Putti, M. ; Aebersold, H.U. ; Lehmann, E. ; Orgiani, P. ; Tumino, A. ; Xi, X.X. ; Ferdeghini, C.

Author_Institution

CNR-INFM-LAMIA, Genova

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2858

Lastpage

2861

Abstract

The effect of disorder on normal state and superconducting properties is studied in a series of neutron irradiated magnesium diboride thin films. Irradiation increases residual resistivity by more than two orders of magnitude and progressively decreases critical temperature down to the complete suppression of superconductivity. In this disorder-controlled set of samples, we analyze magnetoresistivity, extracting the scattering times in each band, and upper critical field. H_c2 is extremely high and only weakly depends on resistivity at low irradiation level. We propose a simple explanation for this puzzling topic, and we discuss the importance of reaching high magnetic field to correctly extrapolate H_c2(0).

Keywords

boron alloys; magnesium alloys; magnetoresistance; neutron radiography; superconducting critical field; superconducting thin films; superconducting transition temperature; superconducting transitions; MgB₂; critical field; critical temperature; magnesium diboride thin film; magnetoresistivity; neutron irradiation; residual resistivity; superconducting property; Conductivity; Magnesium compounds; Magnetic analysis; Magnetoresistance; Neutrons; Scattering; Superconducting thin films; Superconductivity; Temperature; Transistors; Magnesium compounds; magnetic field measurements; magnetoresistance; neutron radiation effects;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.899998

Filename

4278087