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A microscopic model producing hole attraction in the CuO 2 planes is proposed based on competing magnetic interactions. The present mechanism differs from the recent theories of Goddard and co-workers and Aharony and co-workers by the fact that the pairing here is exclusively of singlet type.
A theory of amorphization of ordered intermetallic compounds is applied to the case of simultaneous irradiation by electrons and heavy ions. The theory proposes that the local buildup of radiation-induced defects (interstitial-vacancy complexes) to a critical value destabilizes the crystalline...
The spin-glass phase suggested for granular superconductors in an externally applied magnetic field is discussed in detail. The spin-glass order parameter is an n×n , n≡0 Hermitian matrix. As a consequence, we show, by explicit calculation of the critical exponents to order ε=6-d , that the...
We have calculated the energy distribution of excited electrons produced in solids by atom-atom collision. The inelastic losses are assumed to be caused by the electron promotion mechanism. The calculated distribution for single energy crossing depends exponentially on the electron energy...
We have used ultraviolet, x-ray, and inverse-photoemission spectroscopies to characterize the electronic structure of a novel bismuth cuprate compound with an average composition Bi 2.5 Sr 1.5 Ca 1 Cu 2 O y which becomes superconductor at 84 K. The data indicate that the valence band is shifted...
The strong temperature dependence of the Hall effect in YBa 2 Cu 3 O 7 - δ can be understood in terms of a two-band model, with holes on the planes virtually identical to those of La 1.85 Sr 0.15 CuO 4 , and (highly anisotropic) electrons on the chains.
Some properties of a new class of variational wave functions for boson systems are studied. This study extends the Jastrow class, and many-body correlations are implicitly introduced by a coupling of the particle coordinates to subsidiary shadow variables. We prove that the new wave function has...
The amorphous-to-microcrystalline phase transition of Ge in Pb/Ge multilayer geometry has been investigated as a function of layer thicknesses with the use of high-temperature x-ray diffraction techniques. During crystallization, the modulation structure is destroyed and the Pb texture improves....
Absorption of microwaves (9.3 GHz) was measured as a function of an external applied magnetic field in single crystals of YBa 2 Cu 3 O x . Three distinct types of signals were observed successively as the temperature was lowered from T c to 2.4 K. They differ in widths, angular dependences, and...
We have formulated an auxiliary-boson mean-field theory consistent with the SU(2) symmetry of the Heisenberg model. At half filling, we find an infinite number of solutions related by the symmetry. Away from half filling the kinetic energy, acting as a symmetry-breaking field, selects a...
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