Far-Infrared Absorption by Small Particles of YBa2Cu3O6.74

Noritaka Kuroda, Fumio Chida, Yoshiro Sasaki, Yuichiro Nishina, Masae Kikuchi, Ayako Tokiwa, Yasuhiko Syono

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The presence of the superconducting energy gap, 2〉, in YBa2Cu3O6.74 has been observed directly at 45 ±5 cm-1 and at 1.6 K by far-infrared absorption measurements in small particles embedded randomly in a polyethylene film. This result indicates that the gap has the minimum of 2〉min≃0.7 kTc, and thus the gap is finite along any direction in the crystal. Transverse effective charges associated with polar optical phonons at 144, 280, and 315 cm-1 increase by a factor of 4 ~ 5 upon a decrease in the temperature from 295 K to 1.6 K, suggesting the presence of an anomalous electron-phonon coupling in this material.

Original languageEnglish
Pages (from-to)3797-3800
Number of pages4
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 1987 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kuroda, N., Chida, F., Sasaki, Y., Nishina, Y., Kikuchi, M., Tokiwa, A., & Syono, Y. (1987). Far-Infrared Absorption by Small Particles of YBa2Cu3O6.74. Journal of the Physical Society of Japan, 56(11), 3797-3800. https://doi.org/10.1143/JPSJ.56.3797