Pismo uredniku
Enhancement of flux pinning in neutron irradiated MgB2 superconductor
E. Babić
; Department of Physics, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
Đ. Miljanić
; Institute Ruđer Bošković, Bijenička 54, HR-10002 Zagreb, Croatia
K. Zadro
; Department of Physics, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
I. Kušević
; Department of Physics, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
Ž. Marohnić
; Institute of Physics, Bijenička 46, HR-10000 Zagreb, Croatia
Đ. Drobac
; Institute of Physics, Bijenička 46, HR-10000 Zagreb, Croatia
X. L. Wang
; Centre for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia
S. X. Dou
; Centre for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia
Sažetak
m − H loops for virgin and neutron irradiated bulk and powder samples of MgB2 were measured in the temperature range 5 − 30 K in magnetic field B ≤ 1 T. The irradiation at thermal neutron fluences 9 · 1013 and 4.5 · 1014 cm−2 caused very small enhancement of m − H loops at lower temperatures (T < 20 K), whereas the effect at high temperatures was unclear due to the difficulty in achieving exactly the same measurement temperature prior and after irradiation. However, the irradiation at 4.5 · 1015 cm−2 produced clear enhancement of m − H loops (hence Jc) at all investigated temperatures, which provides the evidence for the enhancement of flux pinning in MgB2 due to ion tracks resulting from n+10B reaction. The potential of this technique for the enhancement of flux pinning in high temperature superconductors is briefly discussed.
Ključne riječi
virgin and neutron irradiated MgB2; bulk and powder samples; field B ≤ 1 T; temperature 5 − 30 K clear enhancement of m − H loops at 4.5 · 1015 cm−2; flux pinning
Hrčak ID:
301101
URI
Datum izdavanja:
1.7.2001.
Posjeta: 589 *