Effect of Pt doping on the critical temperature and the upper critical field in YNi2-xPtxB2C for doping range 0<x<0.2
Abstract
We investigate the evolution of superconducting properties by doping nonmagnetic impurity in single crystals of YNi2-xPtxB2C (x=0-0.2) . With increasing Pt doping the critical temperature (Tc) monotonically decreases from 15.85 K and saturates to a value of ∼13K for x≥0.14 . However, unlike usual s -wave superconductors, the upper critical field (Hc2) along both crystallographic directions a and c decreases with increasing Pt doping. Specific-heat measurements show that the density of states [N(EF)] at the Fermi level (EF) and the Debye temperatures (ΘD) in this series remain constant within the error bars of our measurement. We explain our results based on the increase in interband scattering in the multiband superconductor YNi2B2C .
- Publication:
-
Physical Review B
- Pub Date:
- April 2009
- DOI:
- 10.1103/PhysRevB.79.132505
- arXiv:
- arXiv:0809.4274
- Bibcode:
- 2009PhRvB..79m2505M
- Keywords:
-
- 74.25.Op;
- 74.70.Dd;
- 74.62.-c;
- Mixed states critical fields and surface sheaths;
- Ternary quaternary and multinary compounds;
- Transition temperature variations;
- Condensed Matter - Superconductivity;
- Condensed Matter - Materials Science
- E-Print:
- ps file with figures