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By Nikolai M. Plakida, A. N. Ermilov
High-Temperature Superconductors presents an up to date and accomplished assessment of the homes of those interesting fabrics. a lot has been discovered concerning the habit and mechanism of this novel kind of superconductivity during the last 5 years, yet many questions stay unanswered. This booklet provides a useful survey in an effort to support scholars and researchers to consolidate their wisdom and construct upon it. a number of illustrations and tables provide worthy info for experts. A severe comparability of other theoretical types regarding powerful electron correlations, spin fluctuations, phonons and excitons presents a history for figuring out smooth developments within the conception of high-temperature superconductivity.
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Example text
2. Crystal Structure 22 Fig. 9. 18] ~ III >CII E 0 E 0 I'-. 4 La(Sr) Sr(Nd) Nd(Ce) T' T' T* Fig. 10. 28] In the T* phase,the apex oxygens are maintained only in the layer Nd-Sr, while in the layer Nd-Ce the oxygen ions are shifted to the faces. This reconstruction of the lattice in the T' phase brings about a corresponding variation in its parameters compared to the T phase. 1 A. The lattice parameters in the T* phase assume average values intermediate between those in the T and T' phases. The variation in packing of the 02 ions in the T' and T* phases compared to the T phase can be related to the difference in the sizes of the La and Nd ions.
18. The crystal structure of TJ-Ca-Ba-Cu-O compounds, TIll ... (a) and TlI2 ... 9 A in the basal plane. The lattice constant along the c axis depends on the number of copper-oxide planes n. 1 (A) for n = 1, 2, 3, respectively. 5 Bi-Ca-Sr-Cu-O and TI-Ca-Ba-Cu-O Compounds 31 The actual structure of the Bi compounds has orthorhombic distortions. 4A Co ~ Ct. Moreover, a modulation of the oxygen displacements in the Bi - 0 layer along the b axis is observed that results in the increasing of the cell dimension to bo = 5ao.
I A perpendicular to it along the a axis. 12a). 41]. The existence of several equivalent positions for oxygen atoms brings about strongly anharmonic vibrations of these atoms with relatively low frequencies. Such anharmonic phonons can significally enhance the effective attraction between electrons (holes) and thereby increasing Tc (see Sects. 4). We now emphasize once more the most important results obtained in the study of the crystal structure of oxide superconductors. 32 2. Crystal Structure 1.