Effect of γ-irradiation on superconducting transition temperature and resistive transition in polycrystalline YBa2Cu3O(7-δ)
B. I. Belevtsev, I. V. Volchok, N. V. Dalakova, V. I. Dotsenko, L. G. Ivanchenko, A. V. Kuznichenko, I. I. Logvinov
Abstract
A bulk polycrystalline sample of YBa(2)Cu(3)O(7-δ) (δ≈ 0.1) has been irradiated by γ-rays with 60Co source. Non-monotonic behavior of Tc with increasing irradiation dose Φ(up to 220 MR) is observed: Tc decreases at low doses (Φ< 50 MR) from initial value (≈ 93 K) by about 2 K and then rises, forming a minimum. At higher doses (Φ> 120 MR) Tc goes down again. The temperature width of resistive transition increases rather sharply with dose below 75 MR and drops somewhat at higher dose. The results observed are discussed, taking into account the granular structure of sample studied and the influence of γ-rays on intergrain Josephson coupling.
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