First study of the B<sub>1gsub> buckling phonon mode in optimally doped, de-twinned, YBa<sub>2sub>Cu<sub>3sub>O<sub>7−sub><sub>δsub>

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• 作者：Alfred Q.R. Baron ; John P. Sutter ; Satoshi Tsutsui ; Hiroshi Uchiyama ; Takahiko Masui ; Setsuko Tajima ; Rolf Heid ; Klaus-Peter Bohnen
• 关键词：D. Phonons
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2008
• 出版时间：December 2008
• 年：2008
• 卷：69
• 期：12
• 页码：3100-3102
• 全文大小：387 K

文摘

We have measured the buckling, B<sub>1gsub>, phonon mode of optimally doped, de-twinned, YBa<sub>2sub>Cu<sub>3sub>O<sub>7−sub><sub>δsub> using inelastic X-ray scattering (IXS) at BL35XU of SPring-8. Measurements of this mode, which has atomic motion transverse to the Cu–O planes, serve to demonstrate some of the advantages of the unique two-dimensional (2-D) analyzer array at BL35. Analysis based on fitting the entire spectra simultaneously at 10 and 100 K shows that the buckling mode is rather broad in the middle of the zone (near (0.3 0 0)). We see a consistent softening of the mode at 10 K as compared to 100 K for all measured wave-vectors (h 0 0), and a q-dependent softening as zone center is approached.