By J. M. Tranquada, G. Shirane (auth.), George Reiter, Peter Horsch, Gregory C. Psaltakis (eds.)
This NATO complicated examine Workshop was once held at a time whilst there has been little consensus as to the mechanism for prime temperature superconductivity, within the context of an international present process significant alterations in its political alignments and feel of the chance for the longer term. It used to be characterised by way of generosity within the sharing of our uncertainties and speculations, as used to be acceptable for either the subject material and the context. The workshop was once geared up, of necessity round the experimental paintings, as is that this quantity. the place the theoretical paintings is without delay suitable to specific experiments, it really is incorporated within the acceptable sections with them. many of the individuals felt strongly that magnetic fluctuations performed a major function within the mechanism for prime T c, even supposing apart from the IlS R paintings said by means of Luke displaying effects inconsistent with the anyon photograph, and the paintings on flux stages via Lederer, the mechanism remained a subject within the heritage. an enormous concentration was once the phenomenological interpretation of the NMR data.
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Extra info for Dynamics of Magnetic Fluctuations in High-Temperature Superconductors
Lapertot, in Proc. of the Santa Fe Conf. on the Physics of Highly Correlated Electrons Systems, to be published in Physica B. 12. K. B. Lyons, P. A. Fleury, L. F. Schneemeyer, and J. V. Waszczak, Phys. Rev. Lett. 60, 732 (1988). 13. C. Vettier, P. Burlet, J. Y. Henry, M. J. Jurgens, G. Lapertot, L. P. Regnault, and J. Rossat-Mignod, Physica Scripta T29, 110 (1989). 14. M. Sato, S. Shamoto, J. M. Tranquada, G. Shirane, and B. Keimer, Phys. Rev. Lett. 61, 1317 (1988). 15. R. J. Birgeneau and G. Shirane, in Physical Properties of High Temperature Superconductor, edited by D.
L-IO meV and which extends, with appreciable intensity, up to about 30-40 meV. So in the superconducting state there exist only short range dynamical anti ferromagnetic correlations. In particular there is no sign of any incommensurate magnetic scattering both clastic and inelastic. Moreover, a careful analysis shows that the low energy part of the spectrum is depressed [or T At low energies where q gets smaller, the finite size of the correlation length will come into play, and the spin wave cross section will have to be modified to take this into account. In order to examine this regime, we need to employ a different energy scale, and the experiment was moved to the cold source triple-axis spectrometer at RiSe! in Denmark. 6 Using a function C(q,w), as in Ref. 6, the cross section then becomes proportional to C(q,w) =~ q2 + ~ -"l r 2+ ( r CiJ - cq) 2+ 2 r 2]' r + ( CiJ + cq ) (2) where r is the spin wave damping.
Dynamics of Magnetic Fluctuations in High-Temperature Superconductors by J. M. Tranquada, G. Shirane (auth.), George Reiter, Peter Horsch, Gregory C. Psaltakis (eds.)
At low energies where q gets smaller, the finite size of the correlation length will come into play, and the spin wave cross section will have to be modified to take this into account. In order to examine this regime, we need to employ a different energy scale, and the experiment was moved to the cold source triple-axis spectrometer at RiSe! in Denmark. 6 Using a function C(q,w), as in Ref. 6, the cross section then becomes proportional to C(q,w) =~ q2 + ~ -"l r 2+ ( r CiJ - cq) 2+ 2 r 2]' r + ( CiJ + cq ) (2) where r is the spin wave damping.