| Autor: |
Gordon, R. T., Kim, H., Salovich, N., Giannetta, R. W., Fernandes, R. M., Kogan, V. G., Prozorov, T., Bud'ko, S. L., Canfield, P. C., Tanatar, M. A., Prozorov, R. |
| Rok vydání: |
2010 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B 82, 054507 (2010) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.82.054507 |
| Popis: |
The zero temperature value of the in-plane London penetration depth, $\lambda_{ab}(0)$, has been measured in single crystals of Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ as a function of the Co concentration, $x$, across both the underdoped and overdoped superconducting regions of the phase diagram. For $x\gtrsim0.047$, $\lambda_{ab}(0)$ has been found to have values between 120 $\pm$ 50~nm and 300 $\pm$ 50~nm. A pronounced increase in $\lambda_{ab}(0)$, to a value as high as 950 $\pm$ 50~nm, has been observed for $x\lesssim0.047$, corresponding to the region of the phase diagram where the itinerant antiferromagnetic and superconducting phases coexist and compete. Direct determination of the doping-dependent $\lambda_{ab}(0)$ has allowed us to track the evolution of the temperature-dependent superfluid density, from which we infer the development of a pronounced superconducting gap anisotropy at the edges of the superconducting dome. |
| Databáze: |
arXiv |
| Externí odkaz: |
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