FeSe0.94-xSx 单晶中的上临界场和有效钉能

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER Solid State Communications Pub Date : 2024-09-20 DOI:10.1016/j.ssc.2024.115704

Kaixin Wu , Yuxian Wu , Yong Zhao

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引用次数: 0

摘要

我们研究了 FeSe0.94-xSx (x = 0, 0.1) 单晶体的晶体结构和超导性。在 FeSe0.94 和 FeSe0.84S0.1 样品中都检测到了两种不同的相。根据不同磁场下电阻率曲线的温度依赖性得出了临界温度和上临界磁场。研究了混合状态下 FeSe0.94 和 FeSe0.84S0.1 的传输特性。在热激活磁通量运动模型的框架内推导出了有效钉能 U0 与磁场之间的关系。在 FeSe0.84S0.1的 U0 (H) 中观察到了幂律关系 U0 ∼H-α，在 4 T 左右出现了交叉行为，这归因于不同的引脚机制。研究表明，掺杂 S 会显著影响临界温度、有效钉能和上临界磁场。

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Upper critical field and effective pinning energy in FeSe0.94-xSx single crystals

We investigated the crystal structure and superconductivity in the FeSe_0.94-xS_x (x = 0, 0.1) single crystals. Two distinct phases have been detected in both the FeSe_0.94 and FeSe_0.84S_0.1 samples. The critical temperatures and upper critical field were obtained from the temperature dependence of resistivity curves under different magnetic fields. The transport properties of FeSe_0.94 and FeSe_0.84S_0.1 in the mixed state were investigated. The relation between the effective pinning energy U₀ and magnetic field was derived within the framework of the thermally activated flux motion model. A power-law relation U₀ ∼H⁻^α was observed in the U₀ (H) for FeSe_0.84S_0.1, which shows a crossover behavior around 4 T attributed to different pinning mechanisms. It is demonstrated that S doping significantly influences the critical temperature, effective pinning energy, and upper critical field.

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来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.