Physics – Condensed Matter – Superconductivity
Scientific paper
2008-04-18
Physical Review B 77, 214503 (2008)
Physics
Condensed Matter
Superconductivity
ps files with figures (accepted for publication in Phys. Rev. B)
Scientific paper
10.1103/PhysRevB.77.214503
We have measured the magnetotransport properties and Hall effect of a series of epitaxial NbN films grown on (100) oriented single crystalline MgO substrate under different conditions using reactive magnetron sputtering. Hall effect measurements reveal that the carrier density in NbN thin films is sensitive to the growth condition. The carrier density increases by a factor of 3 between the film with highest normal state resistivity (rho_n~3.83micro-Ohm-m) and lowest transition temperature (Tc~9.99K) and the film with lowest normal state resistivity (rho_n~0.94micro-Ohm-m) and highest transition temperature (Tc~16.11K) while the mobility of carriers does not change significantly except for the most resistive films. Our results show that the Tc of NbN is governed primarily by the carrier density rather than disorder scattering. By varying the carrier concentration during growth we can vary the effective disorder (kF_l) from the moderately clean limit to the dirty limit which makes this system ideal to study the interplay of carrier density and disorder on the superconducting properties of an s-wave superconductor.
Chand Madhavi
Chockalingam Subbaiah P.
Jesudasan John
Raychaudhuri Pratap
Tripathi Vikram
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