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FIZIKA A 10 (2001) 2 , 86-94
 
LETTER TO THE EDITOR
ENHANCEMENT OF FLUX PINNING IN NEUTRON IRRADIATED MgB2
SUPERCONDUCTOR
E. BABIĆa, Đ. MILJANIĆb, K. ZADROa,
I. KUŠEVĆa, Ž. MAROHNIĆc,
Đ. DROBACc, X.L. WANGd and S.X. DOUd
aDepartment of Physics, University of Zagreb, Bijenička 32,
HR-10000 Zagreb, Croatia,
bInstitute Ruđer Bošković, Bijenička 54, HR-10002 Zagreb,
Croatia
cInstitute of Physics, Bijenička 46, HR-10000 Zagreb,
Croatia
dCentre for Superconducting and Electronic Materials,
University of Wollongong, Wollongong, NSW 2522, Australia
Received 24 April 2001; revised manuscript received 8 October 2001
Accepted 15 October 2001
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 Ł 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.
PACS numbers: 74.60.Ge,74.60.Jg,74.62.Dh,74.72.Hs
UDC 538.945
Keywords: virgin and neutron irradiated MgB2, bulk and powder samples,
field B Ł 1 T, temperature 5-30
K clear enhancement of m-H loops at 4.5·1015 cm-2, flux pinning
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