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

Abstract

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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References in corpus (5)

• Double superconducting dome and triple enhancement of Tc in the kagome superconductor CsV3Sb5 under high pressure
• Superconductivity in quasi-one-dimensional K${}_2$Cr${}_3$As${}_3$ with significant electron correlations
• Pressure induced superconductivity on the border of magnetic order in MnP
• Superconductivity in quasi-one-dimensional Cs2Cr3As3 with large interchain distance
• Superconductivity at 5 K in quasi-one-dimensional Cr-based KCr3As3 single crystals

Cited by in corpus (14)

• Pressure induced color change and evolution of metallic behavior in nitrogen-doped lutetium hydride
• Emergence of superconductivity on the border of antiferromagnetic order in RbMn6Bi5 under high pressure: A new family of Mn-based superconductors
• Flipping of antiferromagnetic to superconducting states in pressurized quasi-one-dimensional manganese-based compounds
• Superconductivity up to 14.2 K in MnB${}_4$ under pressure
• Spin and charge density waves in the quasi-one-dimensional KMn6Bi5
• Quantifying the nonadiabaticity strength constant in recently discovered highly-compressed superconductors
• Helical magnetic state in the vicinity of the pressure-induced superconducting phase in MnP
• $d$-wave superconductivity as a model for diborides apart MgB${}_2$
• Pressure-induced superconductivity reentrant in transition metal dichalcogenide TiSe2
• Pressure induced antiferromagnetic-tetragonal to nonmagnetic-collapse-tetragonal insulator-metal transition in ThMnAsN
• Record high superconducting transition temperature in Ti${}_{1-x}$Mn${}_x$ alloy with rich magnetic element Mn
• Introduction to High-Temperature Superconductivity for Solid State Chemists
• Unusual antiferromagnetic order and fluctuations in RbMn${}_6$Bi${}_5$
• Unconventional superconductivity emerging along with the strange-metal behavior in UAs2 under pressure