Anisotropic phase diagram and superconducting fluctuations of single-crystalline SmFeAsO0.85F0.15

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTIVITY;    MAGNETIC-FIELD;    UNTWINNED YBA2CU3O7-DELTA;    II SUPERCONDUCTORS;    HEAT;    TRANSITION;    BEHAVIOR;   

DOI  :  10.1103/PhysRevB.83.100513

来源: SCIE

【 摘 要 】

We report on the specific-heat determination of the anisotropic phase diagram of single crystals of optimally doped SmFeAsO1-xFx. In zero field, we find a clear cusplike anomaly in C/T with Delta C/T-c = 24 mJ/mol K-2 at T-c = 49.5 K. In magnetic fields along the c axis, pronounced superconducting fluctuations induce broadening and suppression of the specific-heat anomaly which can be described using three-dimensional lowest-Landau-level scaling with an upper critical field slope of -3.5 T/K and an anisotropy of Gamma = 8. The small value of Delta C/T-c yields a Sommerfeld coefficient gamma similar to 8 mJ/mol K-2, indicating that SmFeAsO1-xFx is characterized by a modest density of states and strong coupling.

【 授权许可】

Free