Absence of phonon-mediated superconductivity in La$_3$Ni$_2$O$_7$ under pressure

Zhenfeng Ouyang; Miao Gao; Zhong-Yi Lu

doi:10.1038/s41535-024-00689-5

paper

Absence of phonon-mediated superconductivity in La $_{3}$ Ni $_{2}$ O $_{7}$ under pressure

arXiv:2403.14400 · doi:10.1038/s41535-024-00689-5

Abstract

A recent experimental study announced the emergence of superconductivity in La $_{3}$ Ni $_{2}$ O $_{7}$ under pressure, with the highest observed superconducting transition temperature ( $T_{c}$ ) reaching approximately 80 K beyond 14 GPa. While extensive studies have been devoted to the electronic correlations and potential superconducting pairing mechanisms, there lack investigations into the phonon properties and electron phonon coupling. Using density functional theory in conjunction with Wannier interpolation techniques, we study the phonon properties and electron phonon interactions in La $_{3}$ Ni $_{2}$ O $_{7}$ under 29.5 GPa. Our findings reveal that the electron phonon coupling is insufficient to solely explain the observed high superconducting $T_{c}$ $\sim$ 80 K in La $_{3}$ Ni $_{2}$ O $_{7}$ . And the calculated strong Fermi surface nesting may explain the experimental observed charge density wave transition in La $_{3}$ Ni $_{2}$ O $_{7}$ . Our calculations substantiate La $_{3}$ Ni $_{2}$ O $_{7}$ is an unconventional superconductor.

5 pages, 4 figures

Absence of phonon-mediated superconductivity in La $_{3}$ Ni $_{2}$ O $_{7}$ under pressure

Abstract

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Cited by in corpus (28)

Absence of phonon-mediated superconductivity in La3​Ni2​O7​ under pressure

Abstract

References in corpus (21)

Cited by in corpus (28)

Absence of phonon-mediated superconductivity in La $_{3}$ Ni $_{2}$ O $_{7}$ under pressure