Conventional superconductor could be explained by BCS theory (for Tc<35K), but the BCS theory is not valid for all superconductors with theincrease of critical temperature (Tc) in the continuous discovery of new
superconductors. Later on, other theories, such as d-wave, line nodes, the point nodes, the s +g wave, the two gap model, have been proposed. After successfully applying the two-gap model on MgB2, we try to measure the magnetic field dependence of low-temperature specific heat on 2H-NbSe2. Subsequently, analysis is focused on checking whether the two-gap model could also be applied to NbSe2 .
Based on this model, the corresponding two gap values are obtained. The nonlinear field dependence of electronic specific heat coefficient is also observed. Moreover, the positive curvature in Hc2(T) is similar to that in the other two-gap superconductor MgB2. Thus, the two-gap model
appears to describe the superconducting gap function of 2H-NbSe2 better than s-wave and line nodes models.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0705106-204644 |
| Date | 05 July 2006 |
| Creators | Chang, Yu-Tung |
| Contributors | Kuan-Jiuh Lin, Yang-Yuan Chen, Hong-Duen Yang, J-Y Lin |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705106-204644 |
| Rights | withheld, Copyright information available at source archive |
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