"Recently, the Ruddlesden-Popper bilayer nickelate La3Ni2O7 has emerged as a superconductor with a transition temperature (Tc) of ~80 K above 14 GPa1-3. Achieving higher Tc in nickelate superconductors, along with the synthesis of reproducible high-quality single crystals without relying on high oxygen-pressure growth conditions, remains a significant challenge4-7. Here we report superconductivity up to 96 K under high pressure in bilayer nickelate single crystals synthesized at ambient pressure."
"Achieving higher Tc in nickelate superconductors, along with the synthesis of reproducible high-quality single crystals without relying on high oxygen-pressure growth conditions, remains a significant challenge4-7. Here we report superconductivity up to 96 K under high pressure in bilayer nickelate single crystals synthesized at ambient pressure. Energy dispersive spectroscopy, single-crystal X-ray diffraction, nuclear quadrupole resonance, and scanning transmission electron microscopy evidenced high homogeneity and crystal quality of the flux-grown La2SmNi2O7- single crystals. La2SmNi2O7 exhibits clear bulk superconductivity, including zero resistivity (Tc"
Ruddlesden–Popper bilayer nickelates have shown high-pressure superconductivity, previously reaching roughly 80 K in La3Ni2O7 above 14 GPa. Flux-grown La2SmNi2O7 single crystals synthesized at ambient pressure exhibit superconductivity up to 96 K under applied high pressure. Energy dispersive spectroscopy, single-crystal X-ray diffraction, nuclear quadrupole resonance, and scanning transmission electron microscopy reveal high chemical homogeneity and excellent crystalline quality in the flux-grown crystals. The material shows clear bulk superconductivity with zero resistivity. The ambient-pressure growth route avoids high oxygen-pressure conditions and enables reproducible high-quality single crystals for further study of enhanced Tc in bilayer nickelates.
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