Browsing FAS Scholarly Articles by Author "Hecker, N. E."

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    • Absence of Anomalous Copper Vibrations in YBa2 Cu3O7−δ 

      Hecker, N. E.; Mook, H. A.; Harvey, J. A.; Hill, N. W.; Moxon, M. C.; Golovchenko, Jene Andrew (American Physical Society (APS), 1994)
      We 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 ...

    • Absence of discontinuities in ion-channeling parameters for YBa2 Cu3O7−δ thin films 

      Hecker, N. E.; Haakenaasen, R.; Golovchenko, Jene Andrew; Chervinsky, J; Eom, C. B. (American Physical Society (APS), 1997)
      We have measured the ion-channeling minimum yield (χmin) and angular width (Ψ1/2) for Y, Ba, Cu, and O in 2000 Å (001)-oriented films of YBa2Cu3O7−δ on MgO. The measurements mapped out a 30 K region around the critical ...