Two types of multistack structures in MgB 2-type superconductor CaAlSi

Hajime Sagayama; Yusuke Wakabayashi; Hiroshi Sawa; Takashi Kamiyama; Akinori Hoshikawa; Stefanus Harjo; Kentaro Uozato; Ajay K. Ghosh; Masashi Tokunaga; Tsuyoshi Tamegai

doi:10.1143/JPSJ.75.043713

Two types of multistack structures in MgB ₂-type superconductor CaAlSi

Hajime Sagayama, Yusuke Wakabayashi, Hiroshi Sawa, Takashi Kamiyama, Akinori Hoshikawa, Stefanus Harjo, Kentaro Uozato, Ajay K. Ghosh, Masashi Tokunaga, Tsuyoshi Tamegai

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Crystal structure analysis of an AlB ₂-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 Al and Si atoms are ordered alternately in honeycomb layers, and Ca atoms are intercalated at regular intervals between the (Al,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.

Original language	English
Article number	043713
Journal	journal of the physical society of japan
Volume	75
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.75.043713
Publication status	Published - 2006 Apr
Externally published	Yes

Keywords

AlB -type structure
CaAlSi
Multistack structure
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.75.043713

Cite this

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title = "Two types of multistack structures in MgB 2-type superconductor CaAlSi",

abstract = "Crystal structure analysis of an AlB 2-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 Al and Si atoms are ordered alternately in honeycomb layers, and Ca atoms are intercalated at regular intervals between the (Al,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.",

keywords = "AlB -type structure, CaAlSi, Multistack structure, Superconductivity",

author = "Hajime Sagayama and Yusuke Wakabayashi and Hiroshi Sawa and Takashi Kamiyama and Akinori Hoshikawa and Stefanus Harjo and Kentaro Uozato and Ghosh, {Ajay K.} and Masashi Tokunaga and Tsuyoshi Tamegai",

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T1 - Two types of multistack structures in MgB 2-type superconductor CaAlSi

AU - Sagayama, Hajime

AU - Wakabayashi, Yusuke

AU - Sawa, Hiroshi

AU - Kamiyama, Takashi

AU - Hoshikawa, Akinori

AU - Harjo, Stefanus

AU - Uozato, Kentaro

AU - Ghosh, Ajay K.

AU - Tokunaga, Masashi

AU - Tamegai, Tsuyoshi

PY - 2006/4

Y1 - 2006/4

N2 - Crystal structure analysis of an AlB 2-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 Al and Si atoms are ordered alternately in honeycomb layers, and Ca atoms are intercalated at regular intervals between the (Al,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.

AB - Crystal structure analysis of an AlB 2-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 Al and Si atoms are ordered alternately in honeycomb layers, and Ca atoms are intercalated at regular intervals between the (Al,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.

KW - AlB -type structure

KW - CaAlSi

KW - Multistack structure

KW - Superconductivity

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