Absence of Anomalous Copper Vibrations in YBa2 Cu3O7−δ
Hecker, N. E.
Mook, H. A.
Harvey, J. A.
Hill, N. W.
Moxon, M. C.
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CitationHecker, N. E., H. A. Mook, J. A. Harvey, N. W. Hill, M. C. Moxon, and J. A. Golovchenko. 1994. Absence of Anomalous Copper Vibrations in YBa2 Cu3O7−δ. Physical Review B 50, no. 21: 16129–16132. doi:10.1103/physrevb.50.16129.
AbstractWe find a normal temperature dependence for the Doppler broadening of the 230-eV resonance in the neutron cross section of Cu65 atoms in YBa2Cu3O7 between 10 and 300 K. No abrupt changes in the copper momentum spectrum corresponding to vibrations in the ab plane were observed in either the superconducting YBa2Cu3O7 or nonsuperconducting YBa2Cu3O6.2 compounds. This result differs from ion-channeling experiments in which sharp changes in the channeling minimum yield and width of the rocking curve indicated irregular vibrational behavior near the superconducting critical temperature.
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