High-Temperature Superconductivity: Experiment and Theory by Nikolai M. Plakida, A. N. Ermilov

By Nikolai M. Plakida, A. N. Ermilov

High-Temperature Superconductors offers an up to date and accomplished overview of the houses of those interesting 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 publication offers a useful survey with the intention to support scholars and researchers to consolidate their wisdom and construct upon it. a good number of illustrations and tables provide necessary info for experts. A severe comparability of other theoretical versions related to robust electron correlations, spin fluctuations, phonons and excitons presents a historical past for knowing sleek traits within the concept of high-temperature superconductivity.

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P -Qa)8 (Q,W). 1 Antiferromagnetism in La2Cu04 Compounds 39 (outgoing) neutron momentum and energy. 9) n where the summation is performed over all the lattice sites n. 11) 0. where the function £j(k) is equal to unity if k is zero or a reciprocal lattice vector, and equal to zero otherwise. By measuring the dependence of the cross section intensity on the direction of Qo. one can determine the direction of spin ordering. (Q,w) = ~ L eiQ(n-m)(s~s~). 12) n,m In the paramagnetic phase, at T > TN, the spin correlations decay exponentially, as the spin separation r increases (sO.

1], a special scattering geometry was chosen, where the momentum of scattered neutrons k is parallel to the reciprocal lattice vector b* : k = (0, (',0) (here a *, b*, and c* are the reciprocal lattice vectors in the orthorhombic phase). In this case, for a fixed momentum vector of the incoming neutrons ko = (v,(,O) in the plane (a*,b*) of reciprocal space, the momentum transfer Q = k - ko = -(v, ( - (',0) would have a constant value v for the component qll in the plane (a*, c*). 12) describing the two-dimensional spin correlations in the CU02 plane.

1,12 - 14]). The antiferromagnetic ordering in the tetragonal phase of YBa2CU306+x is described by the wave vector Q AF = (1/2, 1/2, l), which corresponds to a magnetic unit cell with the parameters (av'2, av'2, c) where a and c are the lattice constants of the tetragonal unit cell of Fig. 12b. The observation of magnetic Bragg peaks (1/2, 112, l) with integral values l unambiguously shows that the magnetic moments at Cu2 ions lie in the basis plane as shown in Fig. 4. The absence of scattering with l = 0 proves that the magnetic moments in the bilayer Cu - Y - Cu are also antiferromagnetically ordered and that there is no magnetic moment on the CuI ions.

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