论文标题
压力诱导的超导率在准二维kmn6bi5中高达9 k
Pressure-induced superconductivity up to 9 K in the quasi-one-dimensional KMn6Bi5
论文作者
论文摘要
基于MN的超导体很少见，这是由于强烈的磁对破坏性效果。在这里，我们报告了在KMN6BI5中发现压力诱导的超导性的，这成为第一个基于三元MN的超导体。在环境压力下，准二维kMn6bi5是一种具有Tn = 75 K的抗磁性金属，通过测量在静水压力下的电阻率和AC磁敏感性，最高14.2 GPA在立方砧座中的14.2 GPA，我们发现其抗衡磁性的过渡量可以完全抑制过过渡的PC = 13 GP = 13 GP = 13 GP = 13 GP = 13 GP = 13 GP = 13 GP =在约14.2 GPa的情况下，显示具有最大tconset = 9.3 K的超导圆顶。在KMN6BI5的温度压力相图和异常大的μ0HC2（0）= 18.9 t超过Pauli限制的情况下，超导与磁性不稳定性的近距离近距离表明非常规磁性介导的削皮机制表明。与二进制MNP相反，三元AMN6BI5（A =碱金属）中晶体结构和化学成分的灵活性可以为寻找更多基于MN的超导体提供新的途径。
The Mn-based superconductor is rare owing to the strong magnetic pair-breaking effect. Here we report on the discovery of pressure-induced superconductivity in KMn6Bi5, which becomes the first ternary Mn-based superconductor. At ambient pressure, the quasi-one-dimensional KMn6Bi5 is an antiferromagnetic metal with TN = 75 K. By measuring resistivity and ac magnetic susceptibility under hydrostatic pressures up to 14.2 GPa in a cubic anvil cell apparatus, we find that its antiferromagnetic transition can be suppressed completely at a critical pressure of Pc = 13 GPa, around which bulk superconductivity emerges and displays a superconducting dome with the maximal Tconset = 9.3 K achieved at about 14.2 GPa. The close proximity of superconductivity to a magnetic instability in the temperature-pressure phase diagram of KMn6Bi5 and an unusually large μ0Hc2(0) = 18.9 T exceeding the Pauli limit suggests an unconventional magnetism-mediated paring mechanism. In contrast to the binary MnP, the flexibility of the crystal structure and chemical compositions in the ternary AMn6Bi5 (A = alkali metal) can open a new avenue for finding more Mn-based superconductors.
