Upper fields and critical current density of K_0.58Fe_1.56Se₂ single crystals grown by one step technique

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• 作者：Zhaoshun Gao ; Yanpeng Qi ; Lei Wang ; Chao Yao ; Dongliang Wang ; Xianping Zhang ; Yanwei Ma
• 关键词：KFe2Se2 ; Single crystals ; Superconductivity
• 刊名：Physica C
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：492
• 期：Complete
• 页码：18-20
• 全文大小：582 K

文摘

Single crystals of K_0.58Fe_1.56Se₂ were successfully synthesized by a new single step process with the onset superconducting transition temperature 31.9 K. The X-ray diffraction patterns suggest that they have high crystalline quality and c-axis orientation. A possible modulation structure of Fe-vacancy along c-axis was observed. The upper critical field has been determined with the magnetic field along ab-plane and c-axis, yielding an anisotropy of about 3.3. It has also been shown that the critical current density of the K_0.58Fe_1.56Se₂ is about 1.7 ¡Á 10⁴ A/cm² at 5 K.