Relationship between the two-carrier model and the superconductor-semiconductor composite model

Coexisting holes and electrons in high-TCmaterials: implications from normal state transport

“…Markiewicz had based an electron-hole interpretation of the DC Hall effect on the peculiar assumption that the hole component of conductivity scales with the measured conductivity, which is unverified [24]. Several other authors have proposed interpretations in terms of two-band models [4], including where the signs of the carriers need not be opposite [25][26][27], percolation models [28], and single band models with variations in mobility [29]. Theoretical explanations that were advanced include the doped Mott insulator [30], Luttinger liquid theory [31], phenomenology of two transport relaxation times [32], and k-space variation or anisotropy in scattering rate [33,34,[35][36][37].…”