Abstract
The discovery of high-temperature superconductivity in La3Ni2O7 and La4Ni3O10 under pressure has garnered extensive attention.Herein,we report systematic investigations on the structure,magnetism,and electrical resistance evolutions of Pr4Ni3O10-δ polycrystalline samples under various pressures.Pr4Ni3O10-δ exhibits density wave transitions on Ni and Pr sublattices at approximately 157.6 and 4.3 K,respectively.The density wave can be progressively suppressed by pressure.A structural transformation from the monoclinic P21/a space group to the tetragonalI4/mmmoccurs around 20 GPa.An apparent drop in resistance with an evident magnetic field dependence is observed at pressures above 20 GPa,indicating the emergence of superconductivity.The discovery of superconductivity in Pr4Ni3O10-δ broadens the family of nickelate superconductors.Pr4Ni3O10-δ provides a new platform for investigation of the mechanisms of superconductivity in the Ruddlesden-Popper phases of nickelates.
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