Superconducting properties of thermally-relaxed Zr_80Co_20 metallic glass.

Scientific paper - Original scientific paper

• Author: Ivan Kokanović
• Author: Boran Leontić
• Author: Jagoda Lukatela
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

We have studied the effect of thermal relaxation on the superconducting properties of Zr_80Co_20 metallic glass by means of differential scanning calorimetry and electrical resistivity measurements in the vicinity of the superconducting transition temperature T_c. Experimental values for the crystallisation temperature and activation energy of the crystallisation processes were derived by studying these processes at different heating rates. The T_c of the Zr_80Co_20 metallic glass thermally relaxed with a heating rate of 60 K/min to slightly below its first crystallisation exotherm is higher than in unrelaxed Zr_80Co_20 metallic glass, whereas in all other thermally relaxed samples Tc decreases with decreasing heating rates and increasing temperature of relaxation. The homogeneity of the thermally relaxed Zr_80Co_20 metallic glass is discussed by using the superconducting transition width as a criterion. The superconducting transitions of thermally relaxed Zr_80Co_20 metallic glass samples are characterised by a sharp fall in electrical resistance. This suggests that the samples are homogeneous on a spatial scale of less than the zero-temperature coherence length ζ0.

• Keywords (english): thermal relaxation; superconductivity; transition temperature Tc; homogeneity; crystallisation exotherm; electrical resistance
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review
• Publication version: Published version
• Journal title: Fizika A
• Numbering: vol. 15, no. 1, pp. 17-24
• p-ISSN: 1330-0008
• URN:NBN: urn:nbn:hr:217:822783
• Publication: 2006
• Document URL: http://fizika.hfd.hr/fizika_a/av06/a15p017.htm
• Type of resource: Text
• Access conditions: Open access
• Created on: 2019-10-15 14:42:27