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

31 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

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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.",

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AU - Tsuda, S.

AU - Yokoya, T.

AU - Shin, S.

AU - Imai, M.

AU - Hase, I.

PY - 2004/3/30

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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.

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

Abstract

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