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Bridging ambient- and high-pressure superconductivity in La₂LnNi₂O₇ films · arXivDesk

2608.17745Aug 18, 202631 pages, 4 figures

Bridging ambient- and high-pressure superconductivity in La $_2$ LnNi $_2$ O $_7$ films

Motoki Osada, Chieko Terakura, Shusaku Imajo, Jean-Baptiste Morée, Akiko Kikkawa, Masamichi Nakajima, Hsiao-Yi Chen, Yusuke Nomura +4

Superconductivity Materials Science Strongly Correlated Electrons

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Abstract

The discovery of high critical-temperature $T_{\mathrm{c}}$ superconductivity near 80 K in bilayer nickelates under high pressure has sparked extensive studies. While superconductivity exceeding 40 K was subsequently discovered at ambient pressure in compressively strained films, the relationship between ambient- and high-pressure regimes remains an open question. Here we present a systematic investigation of superconductivity in compressively strained La $_2$ LnNi $_2$

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_7

films (Ln = lanthanides) at ambient and high pressures. The normal-state resistivity at ambient pressure, revealed by suppressing superconductivity with magnetic fields of 59 T, tends toward

T^2

behaviour. Under high pressure in a cubic-anvil cell,

T_{\mathrm{c}}

was enhanced from 41-42 K at ambient pressure to 67-73 K at 16 GPa. On the other hand, lattice compression induced by Ln substitution, which may mimic effects of pressure, lowers

T_{\mathrm{c}}

. In both cases,

T_{\mathrm{c}}

correlates with the evolution of normal-state transport between

T^2

and

T

-linear behaviour, offering insight into the interplay between lattice structure and superconductivity in bilayer nickelates.

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