2008/03/07 by Gang Mu, J. D. Fan, Y. M. Malozovsky +5 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1016/j.physc.2013.03.007
published as Chin.Phys.Lett. 25, 2221-2224 (2008) · 4 pages, 4 figures,Corrected typos
arxiv created 2008/03/07 · openalex publication_date 2013/04/08 · arxiv updated 2013/05/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report the specific heat measurements on the newly discovered Fe-based layered superconductor LaO0.9F0.1-deltaFeAs with the onset transition temperature Tc ≈ 28 K. A nonlinear magnetic field dependence of the electronic specific heat coefficient gamma(H) has been found in the low temperature limit, which is consistent with the prediction for a nodal superconductor. The maximum gap value Delta0 ≈ 3.4±0.5 meV was derived by analyzing gamma(H) based on the d-wave model. We also detected the electronic specific heat difference between 9 T and 0 T in wide temperature region, a specific heat anomaly can be clearly observed near Tc. The Debye temperature of our sample was determined to be about 315.7 K. Our results suggest an unconventional mechanism for this new superconductor.