论文标题
II型超导率低于SN0.4SB0.6中的4K
Type-II Superconductivity below 4K in Sn0.4Sb0.6
论文作者
论文摘要
在本文中，我们报告了SN0.4SB0.6在4K以下的单晶中的超导性发生。 Rietveld精制粉末XRD数据证实了AS生长晶体的相纯度，在R-3M空间组中结晶，并在C方向上具有细长（2XC）单位细胞。扫描电子显微镜（SEM）图像和EDAX测量证实了层流的生长，并且接近所需的化学计量比。拉曼光谱数据显示了110和135cm-1时SN-SB和SB-SB模式的振动模式。 ZFC（零场冷却）在10OE进行的磁化测量结果显示，在4K处显示了急剧的超导转变，以及3.5k的次要步骤。另一方面，在FC测量中观察到顺磁性Meissner效应（PME）。在2、2.2、2.5、2.7、2.7、3、3.2、3.5和3.7K处的磁化与应用场图（M-H）图显示了分别在69.42OE和630OE处观察到的超导性的II典型II性质。 II型超导性也通过计算出的Ginzburg-Landau Kappa参数值为3.55确认。特征长度。还计算了相干长度和穿透深度。从R-T图观察到弱颗粒耦合，其中电阻不会降至零至2K。
In this article, we report the occurrence of superconductivity in Sn0.4Sb0.6 single crystal at below 4K. Rietveld refined Powder XRD data confirms the phase purity of as grown crystal, crystallizing in rhombohedral R-3m space group with an elongated (2xc) unit cell in c-direction. Scanning Electron Microscope (SEM) image and EDAX measurement confirm the laminar growth and near to desired stoichiometry ratio. Raman Spectroscopy data shows the vibrational modes of Sn-Sb and Sb-Sb modes at 110 and 135cm-1. ZFC (Zero-Field-Cooled) magnetization measurements done at 10Oe showed sharp superconducting transitions at 4K along with a minor step at 3.5K. On the other hand, Paramagnetic Meissner Effect (PME) is observed in FC measurements. Magnetization vs applied field (M-H) plots at 2, 2.2, 2.5, 2.7, 3, 3.2, 3.5, and 3.7K shows typical Type-II nature of observed superconductivity with lower and upper critical fields (Hc1 and Hc2) at 69.42Oe and 630Oe respectively at 2K. Type-II superconductivity is also confirmed by calculated Ginzburg-Landau Kappa parameter value of 3.55. Characteristics length viz. coherence length and penetration depth are also calculated. Weak granular coupling is observed from R-T plot, in which resistance is not dropping to zero down to 2K.
