Abstract
Abstract Effect of hydrogen absorption on superconducting and transport properties has been studied on YBa 2 Cu 3 O 6.9 , Bi 2 Sr 2 CaCu 2 O 8+y and Bi 1.6 Pb 0.4 Sr 2 Ca 2 Cu 3 O 10+y . We found that the introduction of hydrogen into the system decreases one hole carrier per one hydrogen. The variation of T c with hydrogen concentration strongly depends on the preferential site occupation of hydrogen. Our results support the model that T c is largely determined by the concentration of mobile holes on the CuO 2 plane.
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