Infrared absorption and far-infrared diffuse reflection spectra in Pb-doped Bi?Sr?Ca?Cu?O high-temperature superconductor |
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Authors: | Liyun Zhong Jiye Cai Yi Liu Honggao Tang Yuping Sun and Jiaju Du |
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Institution: | (1) Anhui Institute of Optics & Fine Mechanics, Academia Sinica, 230031 Hefei, People's Republic of China;(2) Institute of Solid State Physics, Academia Sinica, 230031 Hefei, People's Republic of China |
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Abstract: | In this paper we study the room-temperature infrared transmission spectra (400–1600cm–1) and far-infrared diffuse reflection spectra (50–450cm–1) in Pb-doped Bi–Sr–Ca–Cu–O (2223) single phase (Tc=107k, sp1), multiphase (Tc=110k, sp2) and nonsuperconducting samples (sp3). The spectral features in superconductor are totally different from those in nonsuperconductor, which show the different crystal structure. The correlation existing between a factor group analysis of the phonons in (2223) and (2212) compounds affords a tentative assignment of ir-active modes in Pb-doped (2223) single phase by comparison with reported data in (2212) materials. The Cu–O stretching Eu vibration (605cm–1) of CuO2 layers is the characteristic vibrational mode related perovskitelike crystal structures. Two phonon coupling effect emerges in the infrared transmission spectra in Pb-doped superconductor. The Ca–O vibration A2u (254cm–1) might be related to superconductivity of Bi-based family. |
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