Mo3Sb7中的脆性结构转变
Fragile structural transition in Mo3Sb7
摘要：
研究了轻掺杂Cr、Ru或Te的Mo $_3$ Sb $_7$单晶，以探索超导性、磁性和四元结构转变之间的相互作用。在53K处的结构转变对引入额外电子的Ru或Te替代非常敏感，但对Cr替代稳定。在超导Mo $_{2.91}$ Ru $_{0.09}$ Sb $_7$和Mo $_3$ Sb $_{6.975}$ Te $_{0.025}$中没有观察到结构转变的迹象。而3at%Cr掺杂仅轻微抑制了48K的结构转变，而在1.8K以上没有留下任何超导电性的痕迹.磁性分析表明，Mo $_3$ Sb $_7$中的二聚体间相互作用接近临界值，是结构转变所必需的。所有的掺杂剂都抑制Mo $_3$ Sb $_7$的超导电性。超导性不需要四元结构。
英文摘要：
Mo$_3$Sb$_7$ single crystals lightly doped with Cr, Ru, or Te are studied in order to explore the interplay between superconductivity, magnetism, and the cubic-tetragonal structural transition. The structural transition at 53\,K is extremely sensitive to Ru or Te substitution which introduce additional electrons, but robust against Cr substitution. No sign of a structure transition was observed in superconducting Mo$_{2.91}$Ru$_{0.09}$Sb$_7$ and Mo$_3$Sb$_{6.975}$Te$_{0.025}$. In contrast, 3at\% Cr doping only slightly suppresses the structural transition to 48\,K while leaving no trace of superconductivity above 1.8\,K. Analysis of magnetic properties suggests that the interdimer interaction in Mo$_3$Sb$_7$ is near a critical value and essential for the structural transition. All dopants suppress the superconductivity of Mo$_3$Sb$_7$. The tetragonal structure is not necessary for superconductivity.
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