交流磁化率和磁化强度测量中最佳掺杂SmFeAsO $_{0.8}$ F $_{0.2}$的涡旋动力学和不可逆线
Vortex dynamics and irreversibility line in optimally doped SmFeAsO$_{0.8}$F$_{0.2}$ from ac susceptibility and magnetization measurements
摘要：
对最佳掺杂的SmFeAsO $_{0.8}$ F $_{0.2}$超导体进行了交流磁化率和静态磁化强度的测量。绘制了超导态的场-温度相图，特别导出了磁通线点阵的特征。在热激活磁通蠕动的框架下，推导了晶粒内脱钉能与磁场强度的关系，揭示了高场区晶粒内脱钉能与1/H的关系.外推的晶粒内的临界电流密度在零温度和零磁场的限制，显示出一个显着的高值$J_{c0}(0) \sim 2 \cdot 10^{7}$ A/cm $^{2}$，这表明该材料是相当有趣的潜在的未来技术应用。
英文摘要：
Ac susceptibility and static magnetization measurements were performed in the optimally doped SmFeAsO$_{0.8}$F$_{0.2}$ superconductor. The field - temperature phase diagram of the superconducting state was drawn and, in particular, the features of the flux line lattice derived. The dependence of the intra-grain depinning energy on the magnetic field intensity was derived in the thermally-activated flux creep framework, enlightening a typical 1/H dependence in the high-field regime. The intra-grain critical current density was extrapolated in the zero temperature and zero magnetic field limit, showing a remarkably high value $J_{c0}(0) \sim 2 \cdot 10^{7}$ A/cm$^{2}$, which demonstrates that this material is rather interesting for the potential future technological applications.
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