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首页> 外文期刊>Physica, C. Superconductivity and its applications >Superconductivity and thermal properties of sulphur doped FeTe with effect of oxygen post annealing
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Superconductivity and thermal properties of sulphur doped FeTe with effect of oxygen post annealing

机译：氧后退火对硫掺杂FeTe的超导电性和热性能的影响

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Here, we report the synthesis and characterization of sulphur-substituted iron telluride i.e. FeTe_(1-x)S_x; (x = 0-30 %) system and study the impact of low temperature oxygen (O_2) annealing as well. Rietveld analysis of room temperature X-ray diffraction (XRD) patterns shows that all the compounds are crystallized in a tetragonal structure (space group P4mm) and no secondary phases are observed. Lattice constants are decreased with increasing S concentration. The parent compound of the system i.e. FeTe does not exhibit superconductivity but shows an anomaly in the resistivity measurement at around 78 K, which corresponds to a structural phase transition. Heat capacity C_p(T) measurement also confirms the structural phase transition of FeTe compound. Superconductivity appears by S substitution; the onset of superconducting transition temperature is about 8 K for FeTe_(0.75)S_(0.25) sample. Thermoelectric power measurements S(T) also shows the superconducting transition at around 7 K for FeTe_(0.75)S_(0.25) sample. The upper critical fields H c_2(10%), Hc2(50%) and H c2(90%) are estimated to be 400, 650 and 900 kOe respectively at 0 K by applying Ginzburg Landau (GL) equation. Interestingly, superconducting volume fraction is increased with low temperature (200 °C) O_2 annealing at normal pressure. Detailed investigations related to structural (XRD), transport [S(T), R(T)H], magnetization (AC and DC susceptibility) and thermal [Cp(T)] measurements for FeTe 1-xS:O_2 system are presented and discussed.
机译：在这里，我们报告了硫取代的碲化铁，即FeTe_（1-x）S_x的合成与表征。 （x = 0-30％）系统，并研究低温氧（O_2）退火的影响。室温X射线衍射（XRD）图的Rietveld分析表明，所有化合物均以四方结构（空间群P4 / nmm）结晶，没有观察到第二相。晶格常数随着S浓度的增加而降低。该系统的母体化合物即FeTe并没有表现出超导性，而是在78 K左右的电阻率测量中显示出异常，这对应于结构相变。热容C_p（T）测量也证实了FeTe化合物的结构相变。通过S取代出现超导;对于FeTe_（0.75）S_（0.25）样品，超导转变温度的开始约为8K。热电功率测量值S（T）还显示了FeTe_（0.75）S_（0.25）样品在约7 K处的超导转变。通过应用Ginzburg Landau（GL）方程，在0 K时，上临界场H c_2（10％），Hc2（50％）和H c2（90％）分别估计为400、650和900 kOe。有趣的是，在常压下通过低温（200°C）O_2退火可以增加超导体积分数。介绍了有关FeTe 1-xS：O_2系统的结构（XRD），传输[S（T），R（T）H]，磁化强度（交流和直流磁化率）和热[Cp（T）]的详细研究，讨论过。

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