한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제26권1호
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  • Pages.10-13
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  • 2024
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
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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)
  • 투고 : 2024.03.04
  • 심사 : 2024.03.25
  • 발행 : 2024.03.31
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초록

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.

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과제정보

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

참고문헌

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