Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Raman-tensor analysis of phonon modes in (Pb, Bi)2Sr2CaCu2O8+δ

  • Ji Yoon Hwang (Department of Physics, Incheon National University) ;
  • Sae Gyeol Jung (Department of Physics and Astronomy, Seoul National University) ;
  • Dong Joon Song (Department of Physics and Astronomy, Seoul National University) ;
  • Changyoung Kim (Department of Physics and Astronomy, Seoul National University) ;
  • Seung Ryong Park (Department of Physics, Incheon National University)
  • Received : 2024.03.04
  • Accepted : 2024.03.25
  • Published : 2024.03.31
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Abstract

We performed angle-resolved Raman spectroscopy experiments on lead-doped and undoped Bi2Sr2CaCu2O8+δ(Bi2212) samples using a 660 nm laser and analyzed the Raman tensor of the phonon modes. The phonon mode was clearly observed at the 60, 103, and 630 cm-1 Raman shifts. The 60, 630 cm-1 peaks were only clearly observed when the incident and scattered light polarizations were configured to be parallel. The polarization angle dependence of the amplitude of the 60, 630 cm-1 peak on the parallel configuration shows a twofold symmetry; therefore, both peaks originate from Ag phonons and the crystal structure of Bi2212 should be considered orthorhombic. On the other hand, the 103 cm-1 peak is clearly observed in both parallel and perpendicular configurations. Remarkably, the off-diagonal component of the Raman tensor of the 103 cm-1 peak showed an anti-symmetry that could not be realized within the known crystal structure of Bi2212. The implications of our findings are discussed.

Keywords

Acknowledgement

This paper was supported by research funds from Incheon National University in 2023.

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