Strong superconductivity-induced phonon self-energy effects

V. Hadjiev, Xingjiang Zhou, T. Strohm, M. Cardona, Q. Lin, C. Chu

研究成果: Article同行評審

68 引文 斯高帕斯(Scopus)

摘要

We report strong superconductivity-induced phonon renormalization effects observed in the (Formula presented) superconductor (Formula presented) K). At the transition from the normal to the superconducting state, the (Formula presented) phonons at 240 and 390 (Formula presented), which correspond to vibrations of the plane oxygen atoms with some admixture of calcium vibrations, display an abrupt softening, and increase in linewidth within a rather narrow temperature interval. The changes of phonon self-energy are accompanied by a strong enhancement of the Raman intensity of the phonons in the superconducting state. The (Formula presented) Raman peak at 575 (Formula presented), related to the apex oxygen, and that at 487 (Formula presented) (tentatively attributed to excess oxygen) are not detectable in the normal state for incident light polarization in the (Formula presented) plane. They, however, show up in the superconducting state as coupled phonon-electron excitations. To our knowledge, such phonon self-energy effects are the strongest ones reported for the superconducting cuprates so far.

原文English
頁(從 - 到)1043-1050
頁數8
期刊Physical Review B - Condensed Matter and Materials Physics
58
發行號2
DOIs
出版狀態Published - 1998

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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