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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structural and physical properties of Na-substituted K0.8Fe2-ySe2 single crystal
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Structural and physical properties of Na-substituted K0.8Fe2-ySe2 single crystal

机译：Na替代K0.8Fe2-YSE2单晶的结构和物理性质

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In this study, the superconducting NaxK1-xFe2-ySe2 (x = 0.16) crystals via the self-flux technique were produced. A successive plate-like surfaces aligned in ab-plane were observed from SEM images. A set of 001 reflections, typical for ferroselenides of alkali metals which apparently correspond to the main 245 phase, is observed on XRD single crystal pattern. Magnetization against temperature measurement in ZFC mode shows a significant transition at around 31 K. It should be emphasized that we have observed the stable superconducting phase in the system for over two years, in the medium where H2O-O-2 content is less than 0.1 ppm. However the superconducting phase in the system is quite non-durable in the atmospheric air. From magneto-resistance measurements, it is observed that Na0.16K0.64Fe2-ySe2 system shows very weak TAFF behavior in the applied field of 7 T, suggesting the existence of strong pinning force in the system. The critical current density, J(c)(0), calculated from the hysteresis loops are found as 6.7 x 10(4) A/cm(2) at 5 K. H(irr )is estimated to be 10.70, 14.48, and 9.78 Tat the temperatures of 5, 10, and 20 K, respectively. (C) 2018 Elsevier B.V. All rights reserved.
机译：在该研究中，制备了通过自励焊技术的超导NAXK1-XFE2-YSE2（x = 0.16）晶体。从SEM图像观察到在AB平面中排列的连续板状表面。在XRD单晶图案上观察到显然对应于主245相的碱金属的碱金属的丙酮糖烯化物的典型反射。磁化ZFC模式下的温度测量显示出大约31 K的显着过渡。应该强调的是，在H2O-O-2含量小于0.1的介质中，我们已经观察到系统中的稳定超导相。 PPM。然而，系统中的超导相位在大气空气中非常不耐用。从磁阻测量，观察到Na0.16K0.64Fe2-YSE2系统在7吨的施加领域中显示出非常弱的Taff行为，表明系统中的强钉扎力。从滞后环计算的临界电流密度j（c）（0）被发现为5k.h（irr）的6.7×10（4）A / cm（2）估计为10.70,14.48和9.78 TAT分别为5,10和20 k的温度。 （c）2018年elestvier b.v.保留所有权利。

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