2008/04/30 by L. Ding, C. He, J. K. Dong +7 · 5 citations
Business, Management and Accounting · Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Corporate Taxation and Avoidance #Crystallography #Cuprate #Electrical resistivity and conductivity #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Physics #Specific heat #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.180510
published as Phys. Rev. B 77, 180510(R) (2008) · 4 pages, 4 figures
openalex publication_date 2008/05/22 · arxiv created 2008/05/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/22
The specific heat C(T) of iron-based high-Tc superconductor SmO_1\ensuremath-xFxFeAs (0\ensuremath≤x\ensuremath≤0.2) was systematically studied. For the undoped x=0 sample, a specific heat jump was observed at 130\phantom\rule0.3em0exK. This is attributed to the structural or spin-density-wave transition, which also manifests on resistivity as a rapid drop. However, this jump disappears with slight F doping in the x=0.05 sample, although the resistivity drop still exists. The specific heat C∕T shows clear anomaly near Tc for x=0.15 and 0.20 superconducting samples. Such anomaly has been absent in LaO_1\ensuremath-xFxFeAs. For the parent compound SmOFeAs, C(T) shows a sharp peak at 4.6\phantom\rule0.3em0exK, and with electron doping in the x=0.15 sample, this peak shifts to 3.7\phantom\rule0.3em0exK. It is interpreted that such a sharp peak results from the antiferromagnetic ordering of Sm3+ ions in this system, which mimics the electron-doped high-Tc cuprate Sm_2\ensuremath-xCexCuO_4\ensuremath-\ensuremathδ.