Two types of multistack structures in MgB2-type superconductor CaAlSi

被引：38

作者：

Sagayama, H ^{[1
]}

Wakabayashi, Y

Sawa, H

Kamiyama, T

Hoshikawa, A

Harjo, S

Uozato, K

Ghosh, AK

Tokunaga, M

Tamegai, T

机构：

[1] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[2] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Tokai, Ibaraki 3191195, Japan

[3] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2006年 / 75卷 / 04期

关键词：

CaAlSi; superconductivity; AlB2-type structure; multistack structure;

D O I：

10.1143/JPSJ.75.043713

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Crystal structure analysis of an AlB2-type superconductor, CaAlSi, has been carried out using synchrotron X-rays and neutron diffraction measurements. Two different stackings along the c-axis-5-fold and 6-fold structures-with different values of T-c 6.0 and 8.2 K, respectively, are confirmed. Our results show that AI and Si atoms are ordered alternately in honeycomb layers, and Ca atoms are intercalated at regular intervals between the (AI,Si) layers in both the structures. The 5-fold and 6-fold structures are determined by the arrangement of Al and Si along the c-axis. The relation between T-c and the structure is discussed based on our structural analysis.

引用

页数：4

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