Superconductivity in trilayer nickelate La_4Ni_3O_10 single crystals
arxiv(2023)
摘要
The pursuit of discovering new high-temperature superconductors that diverge
from the copper-based paradigm carries profound implications for elucidating
mechanisms behind superconductivity and may also enable new applications. Here,
our investigation reveals that application of pressure effectively suppresses
the spin and charge order in trilayer nickelate La_4Ni_3O_10 single
crystals, leading to the emergence of superconductivity with a maximum critical
temperature (Tc) of around 30 K. In the normal state, we observe a "strange
metal" behavior, characterized by a linear temperature-dependent resistance
extending up to 300 K. These results could be interpreted as the pressure's
influence, inducing damping on the density-wave gap and spin order, while
promoting spin fluctuations and bringing the associated flat dz2 band into
close proximity with the Fermi surface. This, in turn, fosters strong
correlations and "strange metal" behavior, thus setting the stage for the
eventual emergence of superconductivity. Furthermore, the layer-dependent
superconductivity observed hints at a unique interlayer coupling mechanism
specific to nickelates, setting them apart from cuprates in this regard. Our
findings provide crucial insights into the fundamental mechanisms underpinning
superconductivity, while also introducing a new material platform to explore
the intricate interplay between the spin/charge order, flat band structures,
interlayer coupling, strange metal behavior and high-temperature
superconductivity.
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