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Extra resources for Quantum Electrodynamics (2nd Edition) (Course of Theoretical Physics, Volume 4)

Example text

The lattice constants are and This compound is often termed the 214 structure, because it has two La (Sr), one Cu and four O atoms. Upon examining the unit cell, Fig. 2a reveals that the basic 214 structure is doubled to form a unit cell. Therefore a more proper label might be 428. The reason for this doubling is that every other plane is offset by one-half a lattice constant, so that the unit cell would not be truly repetitive if we stopped counting after one cycle of the atoms. 6 Å apart, separated by two LaO planes which form the charge reservoir that captures electrons from the conducting planes upon doping.

5, one can see that, at there is a plateau at This is the so-called 60 K plateau. There are two different explanations for the origin of the 60 K plateau: the hole concentration in planes at remains unchanged, and the change of hole concentration occurs exclusively in Cu–O chain layers. The second explanations is that this plateau relates directly to the anomaly in LSCO. 6 shows the unit cell of Bi-2212 which has the maximum of 95 K. The dimensions of the tetragonal lattice constants of Bi2212 are and In addition to the double layer intercalated by Ca, the unit cell also contains two semiconducting BiO and two insulating SrO layers, as shown in Fig.

McMillan [2] extended this result to the case of strong-coupling superconductors, and obtained Here the Debye temperature is used as the typical phonon frequency. 4). In BCS-McMillan’s expression for the Debye temperature occurs not only in the pre-exponential factor in the expression but also in the electron-phonon coupling constant which can be presented as where C is a constant for a given class of materials, M is the mass, and is the mean-square average phonon frequency, and Consequently, in BCS-type superconductors, increases as decreases.

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