Abstract
Superconductivity in a ternary germanide, Y2AlGe3, was revealed at the transition temperature of 4.5 K by electrical resistivity and magnetic susceptibility measurements. The magnetization versus magnetic field (M-H) curve indicated that Y2AlGe3 was a type-II superconductor. The lower critical field Hc1 (0) and the upper critical field Hc2(0) were estimated to be 1.66(8) mT and 1.26(15) T. The coherence length ξ(0)GL, penetration depth λ(0) GL, and Ginzburg-Landau (GL) parameter κ(0) obtained from the critical fields were 16.2(5) nm, 631(16) nm, and 38(3), respectively. Specific heat measurements revealed that Y2AlGe3 was a weak-coupling BCS superconductor with an isotropic superconducting gap. The electron-phonon mass enhancement parameter λγ was calculated to be 0.13, which was in good agreement with the weak-coupling limit inferred from the specific heat ΔCe=γTc and 2Δ(0)=kBTc.
| Original language | English |
|---|---|
| Article number | 014716 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 80 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 2011 |
| Externally published | Yes |
Fingerprint
Keywords
- Band calculation
- Specific heat
- Superconductivity
- YAlGe
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Superconducting state in the ternary germanide Y2AlGe 3 with related ThCr2Si2-type structure. / Kase, Naoki; Sasaki, Hironaga; Hayamizu, Hiroki; Akimitsu, Jun.
In: Journal of the Physical Society of Japan, Vol. 80, No. 1, 014716, 01.2011.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Superconducting state in the ternary germanide Y2AlGe 3 with related ThCr2Si2-type structure
AU - Kase, Naoki
AU - Sasaki, Hironaga
AU - Hayamizu, Hiroki
AU - Akimitsu, Jun
PY - 2011/1
Y1 - 2011/1
N2 - Superconductivity in a ternary germanide, Y2AlGe3, was revealed at the transition temperature of 4.5 K by electrical resistivity and magnetic susceptibility measurements. The magnetization versus magnetic field (M-H) curve indicated that Y2AlGe3 was a type-II superconductor. The lower critical field Hc1 (0) and the upper critical field Hc2(0) were estimated to be 1.66(8) mT and 1.26(15) T. The coherence length ξ(0)GL, penetration depth λ(0) GL, and Ginzburg-Landau (GL) parameter κ(0) obtained from the critical fields were 16.2(5) nm, 631(16) nm, and 38(3), respectively. Specific heat measurements revealed that Y2AlGe3 was a weak-coupling BCS superconductor with an isotropic superconducting gap. The electron-phonon mass enhancement parameter λγ was calculated to be 0.13, which was in good agreement with the weak-coupling limit inferred from the specific heat ΔCe=γTc and 2Δ(0)=kBTc.
AB - Superconductivity in a ternary germanide, Y2AlGe3, was revealed at the transition temperature of 4.5 K by electrical resistivity and magnetic susceptibility measurements. The magnetization versus magnetic field (M-H) curve indicated that Y2AlGe3 was a type-II superconductor. The lower critical field Hc1 (0) and the upper critical field Hc2(0) were estimated to be 1.66(8) mT and 1.26(15) T. The coherence length ξ(0)GL, penetration depth λ(0) GL, and Ginzburg-Landau (GL) parameter κ(0) obtained from the critical fields were 16.2(5) nm, 631(16) nm, and 38(3), respectively. Specific heat measurements revealed that Y2AlGe3 was a weak-coupling BCS superconductor with an isotropic superconducting gap. The electron-phonon mass enhancement parameter λγ was calculated to be 0.13, which was in good agreement with the weak-coupling limit inferred from the specific heat ΔCe=γTc and 2Δ(0)=kBTc.
KW - Band calculation
KW - Specific heat
KW - Superconductivity
KW - YAlGe
UR - http://www.scopus.com/inward/record.url?scp=78651308643&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78651308643&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.80.014716
DO - 10.1143/JPSJ.80.014716
M3 - Article
AN - SCOPUS:78651308643
VL - 80
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 1
M1 - 014716
ER -