산소 결핍도 변화에 따른 YBa_2 Cu_3 O_7-y의 열기전력 변화 = Oxygen-Deficiency Dependence of the Thermopower of YBa_2 Cu_3 O_7-y

다국어 초록 (Multilingual Abstract)

To clarify the superconducting mechanism of the high Tc oxide superconductors, we have studied the interactions among electrons and elementary excitations and the electronic energy band structure by measuring the thermoelectric power of YBa_2 Cu_3O_7-y with various oxygen deficiencies. We have found that the major charge carriers in YBa_2Cu_3O_7-y are holes, that the width of the electronic energy band is larger than the intial estimation, and that the interaction between electrons and phnonos in the material is not strong enough to explain the high Tc super conductivity, while we have seen an evidence that there exist strong interactions between electrons and magnetic excitations.