Identical superconducting gap on different Fermi surfaces of Ca(Al0.5Si0.5)2 with the AlB2 structure

S. Tsuda; T. Yokoya; S. Shin; M. Imai; I. Hase

doi:10.1103/PhysRevB.69.100506

Identical superconducting gap on different Fermi surfaces of Ca(Al_0.5Si_0.5)₂ with the AlB₂ structure

S. Tsuda, T. Yokoya, S. Shin, M. Imai, I. Hase

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

32 Citations (Scopus)

Abstract

Angle-resolved photoemission spectroscopy of Ca(Al_0.5Si_0.5)₂ (CaAlSi), which is a superconductor (transition temperature is 7.7 K) with the AlB₂ structure, revealed that superconducting gaps on two Fermi surfaces (FSs) with three-dimensional character around Γ(A) and M(L) in the Brillouin zone provide essentially the same superconducting gap value (∼1.2meV±0.2meV). This is in contrast to the case of MgB₂, in which different FSs exhibit different gap values. The reduced gap value 2Δ(0)/k_BT_c of ∼4.2±0.2 classifies CaAlSi as a moderately strong-coupling superconductor.

Original language	English
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	69
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.69.100506
Publication status	Published - Mar 30 2004
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.69.100506

Cite this

@article{38750183eb284b5b9d7a4e26a5d5668b,

title = "Identical superconducting gap on different Fermi surfaces of Ca(Al0.5Si0.5)2 with the AlB2 structure",

abstract = "Angle-resolved photoemission spectroscopy of Ca(Al0.5Si0.5)2 (CaAlSi), which is a superconductor (transition temperature is 7.7 K) with the AlB2 structure, revealed that superconducting gaps on two Fermi surfaces (FSs) with three-dimensional character around Γ(A) and M(L) in the Brillouin zone provide essentially the same superconducting gap value (∼1.2meV±0.2meV). This is in contrast to the case of MgB2, in which different FSs exhibit different gap values. The reduced gap value 2Δ(0)/kBTc of ∼4.2±0.2 classifies CaAlSi as a moderately strong-coupling superconductor.",

author = "S. Tsuda and T. Yokoya and S. Shin and M. Imai and I. Hase",

year = "2004",

month = mar,

day = "30",

doi = "10.1103/PhysRevB.69.100506",

language = "English",

volume = "69",

journal = "Physical Review B-Condensed Matter",

issn = "1098-0121",

publisher = "American Physical Society",

number = "10",

}

TY - JOUR

T1 - Identical superconducting gap on different Fermi surfaces of Ca(Al0.5Si0.5)2 with the AlB2 structure

AU - Tsuda, S.

AU - Yokoya, T.

AU - Shin, S.

AU - Imai, M.

AU - Hase, I.

PY - 2004/3/30

Y1 - 2004/3/30

N2 - Angle-resolved photoemission spectroscopy of Ca(Al0.5Si0.5)2 (CaAlSi), which is a superconductor (transition temperature is 7.7 K) with the AlB2 structure, revealed that superconducting gaps on two Fermi surfaces (FSs) with three-dimensional character around Γ(A) and M(L) in the Brillouin zone provide essentially the same superconducting gap value (∼1.2meV±0.2meV). This is in contrast to the case of MgB2, in which different FSs exhibit different gap values. The reduced gap value 2Δ(0)/kBTc of ∼4.2±0.2 classifies CaAlSi as a moderately strong-coupling superconductor.

AB - Angle-resolved photoemission spectroscopy of Ca(Al0.5Si0.5)2 (CaAlSi), which is a superconductor (transition temperature is 7.7 K) with the AlB2 structure, revealed that superconducting gaps on two Fermi surfaces (FSs) with three-dimensional character around Γ(A) and M(L) in the Brillouin zone provide essentially the same superconducting gap value (∼1.2meV±0.2meV). This is in contrast to the case of MgB2, in which different FSs exhibit different gap values. The reduced gap value 2Δ(0)/kBTc of ∼4.2±0.2 classifies CaAlSi as a moderately strong-coupling superconductor.

UR - http://www.scopus.com/inward/record.url?scp=2142815780&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2142815780&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.69.100506

DO - 10.1103/PhysRevB.69.100506

M3 - Article

AN - SCOPUS:2142815780

VL - 69

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 10

ER -

Identical superconducting gap on different Fermi surfaces of Ca(Al_0.5Si_0.5)₂ with the AlB₂ structure

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this