ISSN:
1573-7357
Keywords:
61.80J
;
74.70Y
;
78.70B
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract For YNi2B2C, a typical borocarbide superconductor, we have carried out positron annihilation lifetime measurements, before and after a 40 MeV α-irradiation to a fluence of 2X1016 particles/cm2. A 3-lifetime fit, giving improved variance, showed a third lifetime longer than 1 ns and of low (1 to 2%) intensity. This lifetime is due to positronium formation and o-Ps to p-Ps conversion in the porous samples. The irradiation increases the bulk lifetime. τB, calculated from τ1 and τ2, from 181 ps to 213 ps.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00753939
Permalink