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Here, we report that K-doped BaMn2Bi2 shows no experimental evidence ofsuperconductivity down to 1.5 K under pressures up to 35.6 GPa, however, atetragonal to an orthorhombic phase transition is observed at pressure of 20GPa. Theoretical calculations for the tetragonal and orthorhombic phases, onbasis of our high-pressure XRD data, find that the AFM order is robust in bothof the phases in pressurized Ba0.61K0.39Mn2Bi2. Our experimental andtheoretical results suggest that the K-doped BaMn2Bi2 belongs to a strong HundsAFM metal with a hybridization of localized spin electrons and itinerantelectrons, and that its robust AFM order essentially prevents the emergence ofsuperconductivity.

Robust antiferromagnetism preventing superconductivity in pressurized Ba0.61K0.39Mn2Bi2