Columnar defects

Shinde, S.R, S.B Ogale, J Higgins, R.J Choudhary, V.N Kulkarni, T Venkatesan, H Zheng, Ramamoorthy Ramesh, A.V Pogrebnyakov, S.Y Xu, Q Li, X.X Xi, J.M Redwing, and D Kanjilal. "Modification of critical current density of MgB 2 films irradiated with 200 MeV Ag ions." Applied Physics Letters 84 (2004) 2352–2354.