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Phonon Characteristics of High Tc Superconductors from Neutron Doppler Broadening Measurements

Published online by Cambridge University Press:  22 February 2011

Walter J Trela ,
J Eric lynn ,
George H Kwei  and
Kay Meggers
Walter J Trela
Affiliation:
Los Alamos National Laboratory, New Mexico, 87545
J Eric lynn
Affiliation:
Los Alamos National Laboratory, New Mexico, 87545
George H Kwei
Affiliation:
Los Alamos National Laboratory, New Mexico, 87545
Kay Meggers
Affiliation:
Institut fur Reine und Angewandte Kernphysik der Universitat Kiel, University of Kiel, Otto-Hahn-Platz 1, D-24118 Kiel, Germany
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Abstract

Statistical information on the phonon frequency spectrum of materials can be obtained by neutron transmission techniques if they contain nuclei with low energy resonances, narrow enough to be Doppler-broadened. We have carried out measurements using this technique for the doped 2-1-4 system, La2.xBaxCuO4. Two samples with slightly different concentrations of barium, one superconducting, the other not, were examined. Pure Lanthanum Cuprate was also studied. Neutron cross section measurements have been made with high energy resolution and statistical precision on the 60m flight path of LANSCE, the pulsed spallation neutron source at Los Alamos National Laboratory. Measurements on all three materials were made over a range of temperatures from 15K to 300K, with small steps through the critical temperature region near 27K. No significant changes in the mean phonon energy of the lanthanum atoms were observed near the critical temperature of the super-conducting material. It appears however that the mean phonon energy of lanthanum in the superconductor is considerably higher than that in the non-superconductors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 541
Copyright
Copyright © Materials Research Society 1995

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References

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