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1. 中国科学院安徽光学精密机械研究所
2. 中国科学院固体物理研究所
收稿日期:1990-06-02,
纸质出版日期:1991-05-30
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刘奕, 钟丽云, 蔡继业, 汤洪高, 陈梅玲, 邹成就, 李晓戈, 孙玉平, 杜家驹. 掺Pb的Bi-Sr-Ca-Cu-O超导体及非晶体的Raman光谱[J]. 发光学报, 1991,12(2): 127-133
Liu Yi, Zhong Liyun, Cai Jiye, Tang Honggao, Chen Meiling, Wu Chenjiu, Li Xiaoge, Sun Yuping, Du Jiaju. STUDY OF RAMAN SPECTRA FROM Bi(Pb)-Sr-Ca-Cu-O[J]. Chinese Journal of Luminescence, 1991,12(2): 127-133
刘奕, 钟丽云, 蔡继业, 汤洪高, 陈梅玲, 邹成就, 李晓戈, 孙玉平, 杜家驹. 掺Pb的Bi-Sr-Ca-Cu-O超导体及非晶体的Raman光谱[J]. 发光学报, 1991,12(2): 127-133 DOI:
Liu Yi, Zhong Liyun, Cai Jiye, Tang Honggao, Chen Meiling, Wu Chenjiu, Li Xiaoge, Sun Yuping, Du Jiaju. STUDY OF RAMAN SPECTRA FROM Bi(Pb)-Sr-Ca-Cu-O[J]. Chinese Journal of Luminescence, 1991,12(2): 127-133 DOI:
本文研究了Bi
2
Sr
2
CaCu
2
O
8
单晶(
T
c
=85K)、Bi
2-x
Pb
x
Sr
2
Ca
2
Cu
3
O
y
单相(Tc=107K)和Bi(Pb)-Sr-Ca-Cu-O非晶体室温下20-720cm
-1
的Raman光谱.通过谱图的比较
我们认为456-466、631-650cm
-1
是高Tc氧化物的特征谱
它们与Cu-O链及Cu-O面上的强电子-声子耦合有关;掺Pb导致Bi(Pb)-O双层之间氧的分布改变
增强了Bi(Pb)-O双层之间的耦合
从而有助于提高超导转变温度Tc.
Since the discovery of high-
T
c
superconductivity in Bi-Sr-Ca-Cu-O system
a great deal of efforts has been made to study the structure and electronic properties of superconducting phases. The di cussion on Raman spectra of high-
T
c
superconductor aims to clarify the feature of phone structure and to gain information on physical properties of material. Much research work has been done on Raman spectra of Bi-Sr-Ca-Cu-O systeem while a little on Pb-doped Bi-Sr-Ca-Cu-O system.This paper discusses the similarities and differences of Raman spectra from (2212) single crystal (
T
c
=85K
sp1)
Pb doped (2223) phase (
T
c
=107K
sp
2
) and Pb-doped Bi-Sr-Ca-Cu-O nonsuperconductor which is amorphous solid (sp
3
). The spectra involve in 20-720cm
-1
. Raman spectra were excited by an argon laser (λ=514.5nm) and detected by Model SPEX-140 Raman Spectrometer with a resolution of 4cm
-1
. AⅡ the experiments were carried out at room temperature.The lines of 169
456-466 and 631-650cm
-1
only occur in the spectra of sp
1
and sp
2
. The spectrum of sp
3
is quite different from those of sp
1
and sp
2
either in the location of lines or the structure of spectrum
which suggests the structure disparity. The most unambiguous character is that high intensity lines are always narrow
and they pile up on two broad weak backgrounds.
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