Measurements

Absorption Measurements of Certain Changes in the Average by Allison S. K., Duane W.

By Allison S. K., Duane W.

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Overdoped (0,18 < p < 0,27), and metallic (Ô~27 < ;>). not exactly two [15]. In the underdoped région, each extra oxygen atom contributes slightly more than two holes to the overall charge-carrier density. In the optimally doped region, the number of holes created by an added oxygen atom is precisely two. In the overdoped region, each extra oxygen atom contributes only one hole to the overall charge-carrier density. Thus, thep(nó) dependence, where n o is the number of extra oxygen atoms, is nonlinear.

10. In LBCO. on further cooling, the LTO phase transforms into new phases with doubled unit cells, one of which is called the low-temperature tetragonal (LTT) phase [3]. In the LTT phase, the CuOg octahedra rotate about alternate orthogonal axes In successive layers with no change in the magnitude of the tilt, as shown in Fig. 3,10. Tlie underlying interaction that gives rise to the low-temperature structural phases. Including the LIT phase, is the mismatch in preferred lattice constants of the CUO2 layer and the intervening rare-earth oxide layers.

Und in n normiit metal, All ihc stnics above the gap urc assumed emply and those below, lull. conductor, the energy gap is tied to the Brillouin zone, in a superconductor, the energy gap is carried by the Fermi surface. At T= 0 all electrons are accommodated in states below the energy gap, and a minimum energy 2 A must be supplied to produce an excitation across the gap. The BCS theory predicts 19 Tlie BCS model of superconductivity in metals that2A(ï' = Û) = 3,52fcßZö. 9. Figure 2,8 shows the temperature dependence of the magnitude of energy gap, predicted by the BCS theory.

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