Infrared absorption and far-infrared diffuse reflection spectra in Pb-doped Bi?Sr?Ca?Cu?O high-temperature superconductor

Autor:	Yi Liu, Yuping Sun, Jiye Cai, Honggao Tang, Jiaju Du, Liyun Zhong
Rok vydání:	1991
Předmět:	Superconductivity Radiation Materials science High-temperature superconductivity Phonon Analytical chemistry Infrared spectroscopy Crystal structure Condensed Matter Physics Spectral line law.invention Far infrared law Diffuse reflection Electrical and Electronic Engineering Instrumentation
Zdroj:	International Journal of Infrared and Millimeter Waves. 12:239-249
ISSN:	1572-9559 0195-9271
DOI:	10.1007/bf01010298
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3de972a2241edb965d22436875c67fa2 https://doi.org/10.1007/bf01010298 Zobrazit plný text záznamu Full text from SpringerLink