The Hall effect of ceramic samples of Pb2Sr2Y1-xCaxCu3O8 has been investigated for 0 ≦ x ≦ 0.5. The Hall coefficient RH is positive and decreases with increasing x, which is explained within the doped Mott-Hubbard model. For x < 0.1, RH increases with decreasing temperature like a conventional semiconductor. For x= 0.1, RH is almost constant. For 0.2 ≦ x ≦ 0.5, where Tc appears, RH increases with decreasing temperature again, and 1/RHe is expressed as αT + β (α > 0, β > 0). The temperature coefficient α increases with increasing Tc. These temperature dependences of RH are common to high-Tc oxides. Effects of the partial substitution of Fe, Co, Ni, Zn, Ga for Cu on Tc have been also studied for x = 0.5. The decrease in Tc is marked in order of Ga, Co, Zn, Ni, Fe. This is discussed in relation to experimental results on YBa2Cu3O7.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering