Vortex pinning properties in Fe-chalcogenides
Vortex pinning properties in Fe-chalcogenides
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DOI：
10.1088/0953-2048/28/12/125001
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发表时间：
2015-12-01
影响因子：
3.6
通讯作者：
Ferdeghini, C.
中科院分区：
文献类型：
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作者：
Leo, A.;Grimaldi, G.;Ferdeghini, C.
在铁基超导体的家族中，11-家族是在低温下的高场应用中最有吸引力的家族之一。优化大块、晶体和/或薄膜样品的制造工艺是生产实用高功率导体用线材和/或带材的第一步。在这里，我们提出的铁硫族化合物的钉扎性能的比较研究的结果，调查的磁通钉扎机制优化的Fe（Se 1-xTex）和FeSe样品的电流-电压特性，磁阻和磁化测量。特别地，从高达9 T的磁场中的阿克里尼乌斯图，激活能作为磁场的函数U-0（H）导出，而作为温度的函数U（T）的激活能从弛豫磁化曲线导出。高的钉扎能量、高的上临界场对临界温度附近的温度斜率以及高度各向同性的钉扎性质使得铁硫族化物超导体成为高场应用中铜氧化物高温超导体的真实的竞争者。
Among the families of iron-based superconductors, the 11-family is one of the most attractive for high field applications at low temperatures. Optimization of the fabrication processes for bulk, crystalline and/or thin film samples is the first step in producing wires and/or tapes for practical high power conductors. Here we present the results of a comparative study of pinning properties in iron-chalcogenides, investigating the flux pinning mechanisms in optimized Fe(Se1-xTex) and FeSe samples by current-voltage characterization, magneto-resistance and magnetization measurements. In particular, from Arrhenius plots in magnetic fields up to 9 T, the activation energy is derived as a function of the magnetic field, U-0(H), whereas the activation energy as a function of temperature, U(T), is derived from relaxation magnetization curves. The high pinning energies, high upper critical field versus temperature slopes near critical temperatures, and highly isotropic pinning properties make iron-chalcogenide superconductors a technological material which could be a real competitor to cuprate high temperature superconductors for high field applications.