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The Hall coefficient RH has been measured in Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O systems as a function of temperature. In all the systems RH^-1 varies linearly with temperature. Tc decreases as the filling factor {ν} (nH normalized to Cu ions present in the unit cell) increases in the Bi and Tl systems. This behavior is opposite in nature to that observed in the La_2-x{Sr}ₓCuO₄ and YBa₂{Cu}₃O_7-x systems.
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Mandal et al. (1989) studied this question.
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