Download PDF by J. M. Tranquada, G. Shirane (auth.), George Reiter, Peter: Dynamics of Magnetic Fluctuations in High-Temperature

By J. M. Tranquada, G. Shirane (auth.), George Reiter, Peter Horsch, Gregory C. Psaltakis (eds.)

ISBN-10: 1468474901

ISBN-13: 9781468474909

ISBN-10: 1468474928

ISBN-13: 9781468474923

This NATO complicated learn Workshop used to be held at a time while 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 prospect for the long run. It used to be characterised by means of generosity within the sharing of our uncertainties and speculations, as used to be applicable for either the subject material and the context. The workshop was once prepared, of necessity round the experimental paintings, as is that this quantity. the place the theoretical paintings is at once suitable to specific experiments, it truly is incorporated within the applicable sections with them. lots of the members felt strongly that magnetic fluctuations performed a big function within the mechanism for prime T c, even supposing aside from the IlS R paintings stated via Luke exhibiting effects inconsistent with the anyon photograph, and the paintings on flux levels via Lederer, the mechanism remained a topic within the history. an immense concentration was once the phenomenological interpretation of the NMR data.

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Additional resources for Dynamics of Magnetic Fluctuations in High-Temperature Superconductors

Example text

5, but, as show in Fig. 9, there is no detectable inelastic signal up to 40 meV indicating that the optical mode has an energy larger than 50 meV. 45 , I ) .. o n [(~'Q5'OOI o · ~O~~5~~~10~~'~5~~20 2 En~r9Y (m~V) Fig. 7. 15 ~ Fig. 8. 15 showing the intensity modulation typical for an acoustic mode. Q-scans pcrformed at constant energy transfers up to ow = 50 meV give a single peak; the q-width up to liw = 15 meV is close to the experimental resolution, only around 30 meV a q-width value twice the experimental resolution (LlCIrcs.

E M --... ~ en t- 200 Z ::J 0 () 100 o ON ROD , t. OFF ROD o o 0 t. t. 0 -5 5 0 10 meV FIG. 6. Constant q scan at q = 0 for La2Cu04 using high resolution. Quasielastic scattering is clearly observed around zero energy transfer. The data taken off the scattering rod show the background intensity. A recent and very important contribution to the field of magnetism in materials like La2Cu04 is the theoretical solution of the two-dimensional Heisenberg antiferromagnet,7-10 Indeed, La2Cu04 appears to be a prototypical two-dimensional Heisenberg antiferromagnet.

M. Rice, Physica Scripta T29, 72 (1989). 19 NEUTRON SCATIERING MEASUREMENTS OF THE MAGNETIC EXCITATIONS OF HIGH-TEMPERATURE SUPERCONDUCTING MATERIALS H. A. Mook,l G. Aeppli,2,6 S. M. Hayden,3,6 Z. Fisk,4 and D. RytzS 1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 2. 3. 4. 5. 6. AT&T Bell Laboratories, Murray Hill, New Jersey 07974 Institut Laue-Langevin, 38042 Grenoble, France Los Alamos National Laboratory, Los Alamos, New Mexico 87545 Hughes Research Laboratory, Malibu, California 90265 Risel National Laboratory, Roskilde, Denmark INTRODUCTION Since the discovery of superconductivity in (Lal-xBaxhCu04 by Bednorz and Muller l in 1986, there has been an enormous interest in all aspects of this family of materials.

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Dynamics of Magnetic Fluctuations in High-Temperature Superconductors by J. M. Tranquada, G. Shirane (auth.), George Reiter, Peter Horsch, Gregory C. Psaltakis (eds.)

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