Abstract
We investigate interband impurity scattering effects on a double gap structure in the superconducting density of states (SDOS) in a two-band superconductor. Using the self-consistent t-matrix theory, we show how the double gap structure gradually disappears/revives when impurity concentration and the magnitude of impurity potential are varied. The increase of impurity concentration leads to an averaged single gap SDOS due to the mixing of two bands by interband scattering. However, this mixing effect is shown to disappear in the strong interband scattering limit. We also show that the intraband impurity scattering suppresses the interband scattering effect because it tends to exclude electrons away from impurity sites.
| Original language | English |
|---|---|
| Pages (from-to) | 41-45 |
| Number of pages | 5 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 412-414 |
| Issue number | SPEC. ISS. |
| DOIs | |
| Publication status | Published - 2004 Oct |
| Externally published | Yes |
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Keywords
- Density of states
- Impurity effect
- MgB
- Two-band superconductor
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Effects of interband impurity scattering on superconducting density of states in a two-band superconductor. / Ohashi, Yoji.
In: Physica C: Superconductivity and its Applications, Vol. 412-414, No. SPEC. ISS., 10.2004, p. 41-45.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of interband impurity scattering on superconducting density of states in a two-band superconductor
AU - Ohashi, Yoji
PY - 2004/10
Y1 - 2004/10
N2 - We investigate interband impurity scattering effects on a double gap structure in the superconducting density of states (SDOS) in a two-band superconductor. Using the self-consistent t-matrix theory, we show how the double gap structure gradually disappears/revives when impurity concentration and the magnitude of impurity potential are varied. The increase of impurity concentration leads to an averaged single gap SDOS due to the mixing of two bands by interband scattering. However, this mixing effect is shown to disappear in the strong interband scattering limit. We also show that the intraband impurity scattering suppresses the interband scattering effect because it tends to exclude electrons away from impurity sites.
AB - We investigate interband impurity scattering effects on a double gap structure in the superconducting density of states (SDOS) in a two-band superconductor. Using the self-consistent t-matrix theory, we show how the double gap structure gradually disappears/revives when impurity concentration and the magnitude of impurity potential are varied. The increase of impurity concentration leads to an averaged single gap SDOS due to the mixing of two bands by interband scattering. However, this mixing effect is shown to disappear in the strong interband scattering limit. We also show that the intraband impurity scattering suppresses the interband scattering effect because it tends to exclude electrons away from impurity sites.
KW - Density of states
KW - Impurity effect
KW - MgB
KW - Two-band superconductor
UR - http://www.scopus.com/inward/record.url?scp=4644226025&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4644226025&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2003.11.062
DO - 10.1016/j.physc.2003.11.062
M3 - Article
AN - SCOPUS:4644226025
VL - 412-414
SP - 41
EP - 45
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - SPEC. ISS.
ER -