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arXiv 2201.06053cond-mat.supr-con
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准一维KMn6Bi5中压力诱导的超导性

Pressure-induced superconductivity up to 9 K in the quasi-one-dimensional KMn6Bi5

Z. Y. Liu, Q. X. Dong, P. T. Yang, P. F. Shan, B. S. Wang, J. P. Sun, Y. Uwatoko, G. F. Chen, X. L. Dong, Z. X. Zhao, J. -G. Cheng

摘要:

锰基超导体由于其强的磁对破缺效应而十分罕见。在这里,我们报告的发现,压力诱导的超导电性KMn6Bi5,这成为第一个三元锰基超导体。在常压下,准一维KMn6Bi5是反铁磁金属,TN = 75 K。通过在14.2GPa的静水压力下测量其电阻率和交流磁化率,发现在Pc = 13GPa的临界压力下,其反铁磁转变被完全抑制,在此临界压力附近出现体超导,并在14.2GPa附近出现超导圆顶,最大Tconset = 9.3K。超导电性与KMn6Bi5的温压相图中的磁不稳定性非常接近,并且超过泡利极限的异常大的μ0Hc2(0)= 18.9 T表明了非常规的磁性介导的配对机制。与二元MnP相比,三元AMn6Bi5(A =碱金属)的晶体结构和化学组成的灵活性可以为寻找更多的Mn基超导体开辟新的途径。

英文摘要:

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.

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