论文标题
PT掺杂CURH2SE4尖晶石中增强的上临界场的超导性
Superconductivity with the enhanced upper critical field in the Pt-Doping CuRh2Se4 spinel
论文作者
论文摘要
我们使用合并的实验和理论研究报告了PT掺杂对CURH2SE4尖晶石超导性的影响。我们的XRD结果表明，CU（RH1-XPTX）2SE4在结构中以FD3-M的空间组（No. 227）结晶，而晶格参数A则随着PT掺杂而增加。电阻率和磁化率测量结果证明了超导转变温度（TC）形成圆顶状的形状，最大值为x = 0.06，最大值为3.84 k。还可以观察到，PT掺杂略微降低了较低的临界磁场从CUH2SE4中的220 OE降低到Cu中的168 OE（RH0.94PT0.06）2SE4，而它可显着增强上层临界磁场，达到CU（RH0.94PT0.0.06）的最大值，达到了4.93 t。热容量结果表明样品CU（RH0.91PT0.09）2SE4是批量超导体。第一原理的计算表明，PT掺杂导致状态峰密度的红移在费米水平附近，这与实验观察到的类似圆顶的TC一致。
We report the effect of Pt doping on the superconductivity in CuRh2Se4 spinel using a combined experimental and theoretical study. Our XRD results reveal that the Cu(Rh1-xPtx)2Se4 crystallizes in the structure with a space group of Fd3-m (No. 227), and the lattice parameter a increases with Pt doping. The resistivity and magnetic susceptibility measurement results verify that the superconducting transition temperature (Tc) forms a dome-like shape with a maximum value of 3.84 K at x = 0.06. It is also observed that the Pt-doping slightly reduces the lower critical magnetic field from 220 Oe in CuRh2Se4 to 168 Oe in Cu(Rh0.94Pt0.06)2Se4, while it significantly enhances the upper critical magnetic field, reaching the maximum of 4.93 T in the Cu(Rh0.94Pt0.06)2Se4 sample. The heat capacity result indicates that the sample Cu(Rh0.91Pt0.09)2Se4 is a bulk superconductor. First-principles calculations suggest that the Pt-doping leads to a red-shift of a density of state peak near the Fermi level, consistent with the dome-like Tc observed experimentally.
