Calorimetric Evidence for Nodes in the Overdoped Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$
| Autor: | Jang, Dong-Jin, Vorontsov, A. B., Vekhter, I., Gofryk, K., Yang, Z., Ju, S., Hong, J. B., Han, J. H., Kwon, Y. S., Ronning, F., Thompson, J. D., Park, Tuson |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | New Journal of Physics 13, 023036 (2011) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1367-2630/13/2/023036 |
| Popis: | We present low-temperature specific heat of the electron-doped Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$, which does not show any indication of an upturn down to 400 mK, the lowest measuring temperature. The lack of a Schottky-like feature at low temperatures or in magnetic fields up to 9 Tesla enables us to identify enhanced low-temperature quasiparticle excitations and to study anisotropy in the linear term of the specific heat. Our results can not be explained by a single or multiple isotropic superconducting gap, but are consistent with multi-gap superconductivity with nodes on at least one Fermi surface sheet. Comment: 5 pages 4 figures |
| Databáze: | arXiv |
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