Pressure-driven right-triangle shape superconductivity in bilayer nickelate La_3Ni_2O_7
arxiv(2024)
摘要
Here we report a comprehensive study of the crystal structure, resistivity,
and alternating-current magnetic susceptibility in single crystals of
La_3Ni_2O_7, with a hydrostatic pressure up to 104 GPa. X-ray diffraction
measurements reveal a bilayer orthorhombic structure (space group Amam) at
ambient pressure and a transformation into a tetragonal phase (space group
I4/mmm) at ad critical pressure of ∼14 GPa. The transport measurements
reveal a right-triangle shape superconducting region with a maximum T_c of 83
K at 18.0 GPa. The superconductivity is gradually suppressed when applying a
higher pressure, but it can persist up to 90 GPa. Importantly, we measured the
Meissner effect of superconductivity using an alternating-current magnetic
susceptibility technique under pressure and estimated the maximum
superconducting volume fraction of being 48% at 19.4 GPa. Thus, we
demonstrate the bulk nature of superconductivity in the bilayer nickelate
La_3Ni_2O_7 under high pressure. The intimate connection among the
superconductivity, the oxygen content, and the tetragonal structure are
discussed.
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