Superconductors are influenced by high-entropy alloys (HEAs); these have been investigated in various functional materials. REOBiS$_2$ (RE = La, Ce, Pr, Nd, Sm, and Gd in different combinations) single crystals with HEAs at the RE-site were successfully grown using the flux method. The obtained crystals were plate-shaped (1 mm$^2$) with a well-developed c-plane. Ce was present in both trivalent (Ce$^{3+}$) and tetravalent (Ce$^{4+}$) electronic configurations; the concentration of Ce$^{4+}$ at the RE-site was approximately 10 at% in all single crystals. The single crystals showed superconducting transition temperature with zero resistivity within 1.2-4.2 K. The superconducting transition temperature, superconducting anisotropy, electronic specific heat coefficient, and Debye temperature of the crystals were not correlated with the mixed entropy at the RE-site. Except for the electronic specific heat coefficient, the variation of these parameters as a function of mixed entropy showed different trends for equivalent and non-equivalent RE element compositions. Thus, the configuration of RE elements influences the superconducting properties of REOBiS$_2$ single crystals, alluding to a method of modulating transition temperatures.
Structure and composition of the superconducting phase in alkali iron selenide K$_y$Fe$_{1.6+x}$Se$_2$
本文用中子衍射方法研究了绝缘超导钾铁硒化物KPDMATHABMM Fe $_{1.6+x}$ Se $_2$的平均结构和局域晶格畸变的温度演化。在高温顺磁状态下，两种材料都具有单相，其晶体结构类似于铁磷属元素化物的BaFe $_2$ As $_2$家族。而绝缘K $_y$ Fe $_{1.6+x}$ Se $_2$在低温下形成$\sqrt{5}\times\sqrt{5}$铁空位有序块反铁磁（AF）结构，超导化合物自发相分离为具有$\sqrt{5}\times\sqrt{5}$铁空位有序绝缘部分和化学组成为KPDMATHABMP的超导相MQ Fe $_{2}$ Se $_2$和BaFe $_2$为$_2$结构。因此，碱性铁硒化物的超导电性来自于绝缘块AF相的基质中的缺碱K $_z$ Fe $_{2}$ Se $_2$。
The characteristics of the superconducting and magnetic phases in the polycrystalline samples of ruthenocuprates of nominal compositions RuSr2GdCu2O8, Ru0.98Sr2GdCu2O8 and Ru0.5Sr2GdCu2.5O8-d
本文研究了名义成分为RuSr_2GdCu_2O_8、Ru0.98Sr_2GdCu_2O_8和Ru0.5Sr_2GdCu_2.5O_8-d的超导铜氧化物的电阻率随温度的变化关系，以确定超导转变的磁场依赖特性。的Ru/Cu比在母体RuSr 2GdCu 2 O 8的显着减少的效果被证实为相关的超导相的稳定。在比较的特性中的注意到的差异被解释为可能的非均匀成核的超导相在母体xenocuprate。RuSr 2GdCu 2 O 8和Ru0.98Sr2GdCu2O8中的相各向异性，在化合物Ru磁性的存在下，似乎是Hc 2（T）相线显著软化的原因。一个异常降低的磁阻率观察到在约。10 K范围以上的超导转变的开始，这可能表明在样品中的增强的超导波动的存在。温度的正向磁场偏移限制了Ru亚晶格的磁有序态的磁阻和比热特征，这表明探测样品中存在的有效金属类导电通道中铁磁Ru相互作用的影响。的Ru0.5Sr2GdCu2.5O8-d的超导特性揭示了一个显着的贡献的Gd顺磁信号在低温下，解释为一个显着的各向异性的超导相的存在。它的结论是，Ru-Cu取代相的Cu 2 O3-Cu 2 O3
Superconducting gap and nematic resonance at the quantum critical point observed by Raman scattering in $\mathrm{BaFe_{2}}(\mathrm{As}_{1-x}\mathrm{P}_{x}\mathrm{)_{2}}$
Evolution of the electronic and superconducting properties of Re-based quinary high-entropy alloys under chemical and physical pressure
Centre for High Pressure Research, School of Physics, Bharathidasan University（巴拉迪达桑大学物理学院高压研究中心）；Institute for Solid State Physics, The University of Tokyo（东京大学固体物理研究所）；Faculty of Science and Engineering, Tokyo City University（东京都市大学理工学部）；Indian Institute of Science Education and Research Bhopal（印度科学教育与研究学院博帕尔分校）
Charge Fluctuations in the NdO$_{1-x}$F$_{x}$BiS$_{2}$ Superconductors
用中子衍射和对密度函数分析技术研究了超导NdO $_{1-x}$ F $_{x}$ BiS $_{2}$（$x$ =0.2和0.4）的局域原子结构.在非超导$x$ =0.2的组合物中，锥体硫离子的铁畸变位移打破了四重对称性，并且出现了超晶格结构，其峰值出现在叠加在$P4/nmm$对称性的偶反射上的$h+k$奇反射处。在超导$x$ =0.4组合物中，观察到类似的铁磁畸变位移，但具有不同的幅度与面内Bi畸变耦合。这些畸变表明了可能导致电荷局部化和超导性抑制的电荷波动。
Structural and electrical transport properties of superconducting Au{0.7}In{0.3} films: A random array of superconductor-normal metal-superconductor (SNS) Josephson junctions
The structural and superconducting properties of Au{0.7}In{0.3} films, grown by interdiffusion of alternating Au and In layers, have been studied. The films were found to consist of a uniform solid solution of Au{0.9}In{0.1}, with excess In precipitated in the form of In-rich grains of various Au-In phases (with distinct atomic compositions), including intermetallic compounds. As the temperature was lowered, these individual grains became superconducting at a particular transition temperature (Tc), determined primarily by the atomic composition of the grain, before a fully superconducting stat…
Electronic structure of superconducting KC$_8$ and non-superconducting LiC$_6$ graphite intercalation compounds: Evidence for a graphene-sheet-driven superconducting state
Magneto-elastically coupled structural, magnetic and superconducting order parameters in BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$
我们测量了机械应变BaFe $_{2}$（As $_{1-x}$ P $_{x}$）$_{2}$单晶在宽的$x$范围内的输运性质。Néel转变对应力极其敏感，并且这种敏感性随着接近最佳掺杂而增加，即使转变本身被强烈抑制。此外，我们观察到显着的变化，超导转变温度与施加的应变，这反映了变化的组合物$x$的函数。这些实验直接说明了铁基超导体中不同自由度之间的紧密耦合，揭示了磁弹性耦合对磁性和超导转变温度的重要性。
Magnetic field dependence of the temperature derivative of resistivity: a probe for distinguishing the effects of pseudogap and superconducting fluctuations in cuprates
本文研究了Y1-xCaxBa 2（Cu 1-yZny）3 O 7-d晶态薄膜的电阻率温度导数dr（H，T）/dT随磁场的变化关系。从温度导数数据的分析中，我们已经能够相当清楚地区分两个特征温标，（a）强超导波动温度Tscf的开始和（b）赝能隙温度TPG。TSCF和TPG的dr（H，T）/dT的显著不同的特征意味着TSCF和TPG具有不同的物理起源。
Spontaneous stoichiometry change in a single crystal of (Ba1-x Kx)Fe2As2 produced by rapid heating method
为了防止Ba_（1-x）K_xFe_2As_2单晶生长过程中K的损失，我们发展了一种快速加热的Sn助熔剂法。获得了最佳超导转变温度TC约为38 K的大单晶，并对其结构、化学和超导性能进行了研究。此外，还研究了不同温度下生长后退火对晶体生长的影响。扫描电子显微镜微探针研究的样品与Ba.25 K.75 Fe 2 As 2的组合物的目标揭示了一个尖锐的分离的两个阶段的组合物，是建议合理的比例的K和Ba含量。
Growth Optimization of MoSi Thin Film and Measurement of Transport Critical Current Density of its Meander Structure
Free Electron Laser Utilization Laboratory, Raja Ramanna Centre for Advanced Technology（自由电子激光利用实验室，拉贾·拉曼纳先进技术中心）；Homi Bhabha National Institute（霍米·巴巴国立研究所）
Direct Observation of Microstructures on Superconducting Single Crystals of K$_x$Fe$_{2-y}$Se$_2$
钾插层FeSe已被报道为超导转变温度（$T_{\rm c}$ 's）为30-48 K的超导体。然而，目前还没有明确的答案，以确定之间的关系，表面形貌，组成比例和其晶体结构。这份报告直接揭示了这三个特性之间的对应关系，在单晶体与$T_{\rm c}$开始约44 K，使用微取样技术。晶体表面上的岛状部分清楚地具有具有完全FeSe层的K $_x$ Fe $_2$ Se $_2$结构，其与K $_2$ Fe $_4$ Se $_5$相结合形成。这导致出现44 K的$T_{\rm c}$起始。
