Missing superconductivity in BaAlSi with the AlB2 type structure

Shoji Yamanaka; Teruyoshi Otsuki; Takayuki Ide; Hiroshi Fukuoka; Ryotaro Kumashiro; Takeshi Rachi; Katsumi Tanigaki; Fang Zhun Guo; Keisuke Kobayashi

doi:10.1016/j.physc.2006.10.002

Missing superconductivity in BaAlSi with the AlB₂ type structure

Shoji Yamanaka, Teruyoshi Otsuki, Takayuki Ide, Hiroshi Fukuoka, Ryotaro Kumashiro, Takeshi Rachi, Katsumi Tanigaki, Fang Zhun Guo, Keisuke Kobayashi

Advanced Institute for Materials Research (AIMR)

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

23 Citations (Scopus)

Abstract

The solid solutions BaAl_1-xSi_1+x (0 ≤ x ≤ 0.5) were prepared. The compound with the stoichiometric composition (x = 0) did not show superconductivity as reported by other investigators, but the solid solutions with x > 0 became superconductors with a transition temperature T_c = 2.8 K. The comparison of the lattice parameters with those of the other isotypic ternary superconductors MAlSi (M = Ca, Sr) suggested that the superconductivity could be related to the lattice parameter within the (AlSi) plane rather than the interlayer spacing. The band structures near the Fermi level of MAlSi (M = Ca, Sr, Ba) were measured using soft X-ray photoelectron spectroscopy, which were in good agreement with the calculated ones, confirming that the contribution of the d orbitals of the alkaline-earth metals were predominant in the conduction bands.

Original language	English
Pages (from-to)	19-23
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	451
Issue number	1
DOIs	https://doi.org/10.1016/j.physc.2006.10.002
Publication status	Published - 2007 Jan 1

Keywords

AlB type structure
BaAlSi
CaAlSi
SrAlSi
Superconductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2006.10.002

Cite this

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title = "Missing superconductivity in BaAlSi with the AlB2 type structure",

abstract = "The solid solutions BaAl1-xSi1+x (0 ≤ x ≤ 0.5) were prepared. The compound with the stoichiometric composition (x = 0) did not show superconductivity as reported by other investigators, but the solid solutions with x > 0 became superconductors with a transition temperature Tc = 2.8 K. The comparison of the lattice parameters with those of the other isotypic ternary superconductors MAlSi (M = Ca, Sr) suggested that the superconductivity could be related to the lattice parameter within the (AlSi) plane rather than the interlayer spacing. The band structures near the Fermi level of MAlSi (M = Ca, Sr, Ba) were measured using soft X-ray photoelectron spectroscopy, which were in good agreement with the calculated ones, confirming that the contribution of the d orbitals of the alkaline-earth metals were predominant in the conduction bands.",

keywords = "AlB type structure, BaAlSi, CaAlSi, SrAlSi, Superconductivity",

author = "Shoji Yamanaka and Teruyoshi Otsuki and Takayuki Ide and Hiroshi Fukuoka and Ryotaro Kumashiro and Takeshi Rachi and Katsumi Tanigaki and Guo, {Fang Zhun} and Keisuke Kobayashi",

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AU - Yamanaka, Shoji

AU - Otsuki, Teruyoshi

AU - Ide, Takayuki

AU - Fukuoka, Hiroshi

AU - Kumashiro, Ryotaro

AU - Rachi, Takeshi

AU - Tanigaki, Katsumi

AU - Guo, Fang Zhun

AU - Kobayashi, Keisuke

PY - 2007/1/1

Y1 - 2007/1/1

N2 - The solid solutions BaAl1-xSi1+x (0 ≤ x ≤ 0.5) were prepared. The compound with the stoichiometric composition (x = 0) did not show superconductivity as reported by other investigators, but the solid solutions with x > 0 became superconductors with a transition temperature Tc = 2.8 K. The comparison of the lattice parameters with those of the other isotypic ternary superconductors MAlSi (M = Ca, Sr) suggested that the superconductivity could be related to the lattice parameter within the (AlSi) plane rather than the interlayer spacing. The band structures near the Fermi level of MAlSi (M = Ca, Sr, Ba) were measured using soft X-ray photoelectron spectroscopy, which were in good agreement with the calculated ones, confirming that the contribution of the d orbitals of the alkaline-earth metals were predominant in the conduction bands.

AB - The solid solutions BaAl1-xSi1+x (0 ≤ x ≤ 0.5) were prepared. The compound with the stoichiometric composition (x = 0) did not show superconductivity as reported by other investigators, but the solid solutions with x > 0 became superconductors with a transition temperature Tc = 2.8 K. The comparison of the lattice parameters with those of the other isotypic ternary superconductors MAlSi (M = Ca, Sr) suggested that the superconductivity could be related to the lattice parameter within the (AlSi) plane rather than the interlayer spacing. The band structures near the Fermi level of MAlSi (M = Ca, Sr, Ba) were measured using soft X-ray photoelectron spectroscopy, which were in good agreement with the calculated ones, confirming that the contribution of the d orbitals of the alkaline-earth metals were predominant in the conduction bands.

KW - AlB type structure

KW - BaAlSi

KW - CaAlSi

KW - SrAlSi

KW - Superconductivity

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