By Nikolai M. Plakida, A. N. Ermilov
High-Temperature Superconductors offers an updated and complete assessment of the houses of those attention-grabbing fabrics. a lot has been realized in regards to the habit and mechanism of this novel kind of superconductivity over the last 5 years, yet many questions stay unanswered. This e-book provides a useful survey so one can support scholars and researchers to consolidate their wisdom and construct upon it. a lot of illustrations and tables provide necessary details for experts. A serious comparability of alternative theoretical types related to powerful electron correlations, spin fluctuations, phonons and excitons offers a historical past for knowing sleek tendencies within the concept of high-temperature superconductivity.
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Extra info for High-Temperature Superconductivity: Experiment and Theory
The interaction of copper spins in a plane is of two-dimensional nature. Their small value, S = 1/2, is the reason behind the important quantum fluctuations. In this respect, besides exploring the interplay of antiferromagnetism and superconductivity, the study of quantum two-dimensional antiferromagnets is of great interest in its own right. The first indications of the existence of antiferromagnetism in copper-oxide compounds were obtained on the basis of macroscopic measurements of susceptibility.
12 16 10- 2• x clearly shows anticorrelation ofthe intensities of magnetic fluctuations ex: (I Bit 12) and Tc(x). As x increases, the former falls off rapidly, while Tc increases. 6]. Experimental studies of the electronic structure of copper-oxide compounds (Sect. 4) show that, under doping, the holes appear at oxygen ions. 1). A considerable contribution to the destruction of the long-range order is also made by the motion of the hole on antiferromagnetic background. The kinetic energy of the hole is much larger than the exchange interaction Jnn (Sect.
E. the system of spins at copper sites in the CU02 plane with strong antiferromagnetic exchange coupling, and the strongly correlated system of holes at copper and oxygen sites in the same CU02 plane, is not yet quite clear. NMR studies show that a picture of a single one-component spin liquid made of strongly bound singlet states of two holes at copper and neighboring oxygen sites looks most plausible. 17). NMR studies will be discussed in greater detail in Sect. 3. 6) 60 E 40 .... --! 6. § 100 50 0 0 5 10 15 20 25 E.