Far-Infrared Absorption by Small Particles of YBa2Cu3O6.74

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

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Abstract

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
Volume56
Issue number11
DOIs
Publication statusPublished - 1987
Externally publishedYes

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infrared absorption
polyethylenes
phonons
crystals
electrons
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kuroda, N., Chida, F., Sasaki, Y., Nishina, Y., Kikuchi, M., Yamamoto, 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

Far-Infrared Absorption by Small Particles of YBa2Cu3O6.74 . / Kuroda, Noritaka; Chida, Fumio; Sasaki, Yoshiro; Nishina, Yuichiro; Kikuchi, Masae; Yamamoto, Ayako; Syono, Yasuhiko.

In: Journal of the Physical Society of Japan, Vol. 56, No. 11, 1987, p. 3797-3800.

Research output: Contribution to journalArticle

Kuroda, N, Chida, F, Sasaki, Y, Nishina, Y, Kikuchi, M, Yamamoto, A & Syono, Y 1987, 'Far-Infrared Absorption by Small Particles of YBa2Cu3O6.74 ', Journal of the Physical Society of Japan, vol. 56, no. 11, pp. 3797-3800. https://doi.org/10.1143/JPSJ.56.3797
Kuroda, Noritaka ; Chida, Fumio ; Sasaki, Yoshiro ; Nishina, Yuichiro ; Kikuchi, Masae ; Yamamoto, Ayako ; Syono, Yasuhiko. / Far-Infrared Absorption by Small Particles of YBa2Cu3O6.74 In: Journal of the Physical Society of Japan. 1987 ; Vol. 56, No. 11. pp. 3797-3800.
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AU - Syono, Yasuhiko

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