Back to Search
Start Over
Using specific heat to scan gaps and anisotropy of MgB2
- Source :
- Physica C: Superconductivity. :60-62
- Publication Year :
- 2004
- Publisher :
- Elsevier BV, 2004.
-
Abstract
- We performed specific heat measurements to study the superconducting properties of the ∼40 K superconductor MgB 2 , up to 16 T, using polycrystal and single crystal samples. Our results establish the validity of the two-gap model. We tested the effect of disorder by irradiating our sample. This procedure decreased T c down to ∼26 K, but did not suppress completely the smaller gap, at variance with theoretical expectations. A positive effect of the irradiation was the increase of H c2 up to almost 30 T. Our results on the single crystal allow the anisotropy of each band to be determined independently, and show the existence of a cross-over field well below H c2 characterizing the physics of the small-gapped band. We also present preliminary results on Nb 3 Sn, showing similar, but weaker effects.
- Subjects :
- Superconductivity
Materials science
Condensed matter physics
Field (physics)
Band gap
Transition temperature
Energy Engineering and Power Technology
Electronic structure
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Irradiation
Electrical and Electronic Engineering
Anisotropy
Single crystal
Subjects
Details
- ISSN :
- 09214534
- Database :
- OpenAIRE
- Journal :
- Physica C: Superconductivity
- Accession number :
- edsair.doi...........c3d74f4698735c19678a644f30165c47