Thermal effects in photoemission from Bi(111) films on Si(111)-(7 x 7)
文献类型：期刊论文
| 作者 | Han, TZ ; Jia, JF ; Shen, QT ; Dong, GC ; Xue, QK |
| 刊名 | SURFACE SCIENCE
 |
| 出版日期 | 2008 |
| 卷号 | 602期号:1页码:102 |
| ISSN号 | 0039-6028 |
| 中文摘要 | Superconductor CaAlSi currently has the highest T(c) among the ternary silicides with AlB(2) structure. In this paper we report a hybrid microwave method for preparation of CaAlSi from Al, Si powders and Ca granules. Powder x-ray diffraction analysis indicates the CaAlSi is the dominating phase in the obtained sample. The zero-resistance temperature of the as-prepared sample is at 7.65 K and the superconducting transition width (10-90%) is 0.31 K. Long-time annealing in an Ar atmosphere reduced the superconducting transition width (Delta T(c) = 0.15 K). A series of CaAl(1-x)Cu(x)Si (0.01 <= x <= 0.06) samples were also prepared in order to study the substitution effect. It was found that the lattice parameters, both a and c, decrease with increasing Cu content. The T(c) strongly depends on composition, showing a non-linear decrease in CaAl(1-x)Cu(x)Si. The difference in T(c) could be attributed to the lower N(E(F)) and Theta(D) based on the BCS theory. Additionally, a sample of CaAl(1-3x)Cu(x)Si(1+2x) (x = 0.02) was prepared which has the same number of electrons per cell as CaAlSi. It is expected to have approximately the same N(E(F)) as CaAlSi according to the rigid-band model. The T(c) of CaAl(1-3x)Cu(x)Si(1+2x) (x = 0.02) is slightly higher than that of CaAl(1-x)Cu(x)Si (x = 0.02), indicating that N(E(F)) plays a role in the change of T(c). |
| 收录类别 | SCI |
| 公开日期 | 2013-09-23 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/45713]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Han, TZ,Jia, JF,Shen, QT,et al. Thermal effects in photoemission from Bi(111) films on Si(111)-(7 x 7)[J]. SURFACE SCIENCE,2008,602(1):102. |
| APA | Han, TZ,Jia, JF,Shen, QT,Dong, GC,&Xue, QK.(2008).Thermal effects in photoemission from Bi(111) films on Si(111)-(7 x 7).SURFACE SCIENCE,602(1),102. |
| MLA | Han, TZ,et al."Thermal effects in photoemission from Bi(111) films on Si(111)-(7 x 7)".SURFACE SCIENCE 602.1(2008):102. |
入库方式： OAI收割
来源：物理研究所
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