Optical study of electron-Doped cuprate Pr1.3−xLa0.7CexCuO4+δ in under-Doped regime: Revisit the phase diagram

Ryota Ohnishi, Masamichi Nakajima, Shigeki Miyasaka, Setsuko Tajima, Tadashi Adachi, Taro Ohgi, Akira Takahashi, Yoji Koike

研究成果: Article査読

3 被引用数 (Scopus)


A recent progress of reduction process for electron-doped cuprates enabled us to get superconducting samples at very low doping levels. In order to clarify the electronic state of strongly reduced Pr1.3xLa0.7CexCuO4+δ (x = 0.05, 0.10) which exhibit high Tc (∼27 K) superconductivity, we have measured their optical spectra. The reflectivity of these samples was found much higher than the published data for the moderately reduced and non-superconducting samples with the same Ce concentrations. Moreover, the estimated effective electron numbers Neff for x = 0.05 and 0.10 were close to that of the optimally doped and superconducting sample with x = 0.15. Given that the parent compound is a Mott insulator, these results indicate that in the electron-doped cuprates only a small amount of carrier doping changes the system to a high Tc superconductor with a large Fermi surface. At low temperatures, a broad mid-infrared peak appeared even in the superconducting samples.

ジャーナルjournal of the physical society of japan
出版ステータスPublished - 2018

ASJC Scopus subject areas

  • 物理学および天文学(全般)


「Optical study of electron-Doped cuprate Pr<sub>1.3−x</sub>La<sub>0.7</sub>Ce<sub>x</sub>CuO<sub>4+</sub>δ in under-Doped regime: Revisit the phase diagram」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。