High-temperature superconductivity with zero resistance and strange-metal behaviour in La3Ni2O7‑δ
Abstract
Recent experimental observations have showed some signatures of superconductivity close to 80 K in La3Ni2O7 under pressure and have raised the hope of achieving high-temperature superconductivity in bulk nickelates. However, a zero-resistance state—a key characteristic of a superconductor—was not observed. Here we show that the zero-resistance state does exist in single crystals of La3Ni2O7‑δ using a liquid pressure medium at up to 30 GPa. We also find that the system remains metallic under applied pressures, suggesting the absence of a metal–insulator transition proximate to the superconductivity. Moreover, analysis of the normal state T-linear resistance reveals a link between this strange-metal behaviour and superconductivity. The association between strange-metal behaviour and high-temperature superconductivity is very much in line with other classes of unconventional superconductors, including the cuprates and Fe-based superconductors. Further investigations exploring the interplay of strange-metal behaviour and superconductivity, as well as possible competing electronic or structural phases, are essential to understand the mechanism of superconductivity in this system.
- Publication:
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Nature Physics
- Pub Date:
- August 2024
- DOI:
- 10.1038/s41567-024-02515-y
- arXiv:
- arXiv:2307.14819
- Bibcode:
- 2024NatPh..20.1269Z
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- 28 pages, 4+8 figures, including Extended Data Files