Superconductor charge reservoir

Figure 8.6 Schematic depiction of a cuprate superconductor. Doping into the charge reservoir layers results in the transfer of holes to the superconducting layers.

The charge reservoir layer in the cuprate superconductor HgBa2CaCu206+s is ... 

Table 9.2 Lattice parameter relations of important homologous series of superconductors deduced from structural building blocks (Otto, 1992-2002). The c-lattice parameter is given as c = mL[(n, + l)d, + n2if2 + njds], where n, denotes the number of cations in the four-membered formula symbol and d, = charge reservoir distance, c/2 = composition plane (rocksalt) distance and di = infinite layer distance. mL = 1, if Eni = even, i = 1 to 4 (P-lattice), mL = 2, if Sni = odd (l-lattice, A-lattice). (40 2) is comparable to the lattice parameters of BaO or SrO (rocksalt-ty pe).

Fig. 37.19 Unit cell diagram for the high-Fi superconductor YBaiCujO - The lattice structure Is composed of CuO, BaO, CUO2, Y, CUO2, BaO, and CuO layers that are stacked along the c axis. It is important to note that there are two distinct types of copper sites CuO chains and CuO. sheets. The former run along the h axis and serve the role of a charge reservoir. The latter run parallel with the ah plane and are responsible for the delocalization of charge carries, which fosters the occurrence of superconductivity in the material.

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