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Structural phase transition, s±-wave pairing, and magnetic stripe order in bilayered superconductor La3Ni2O7 under pressure
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Structural phase transition, s±-wave pairing, and magnetic stripe order in bilayered superconductor La3Ni2O7 under pressure
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Journal Article
Structural phase transition, s±-wave pairing, and magnetic stripe order in bilayered superconductor La3Ni2O7 under pressure
2024
Overview
Motivated by the recently discovered high-
T
c
superconductor La
3
Ni
2
O
7
, we comprehensively study this system using density functional theory and random phase approximation calculations. At low pressures, the Amam phase is stable, containing the Y
2−
mode distortion from the Fmmm phase, while the Fmmm phase is unstable. Because of small differences in enthalpy and a considerable Y
2−
mode amplitude, the two phases may coexist in the range between 10.6 and 14 GPa, beyond which the Fmmm phase dominates. In addition, the magnetic stripe-type spin order with wavevector (
π
, 0) was stable at the intermediate region. Pairing is induced in the
s
±
-wave channel due to partial nesting between the
M
= (
π
,
π
) centered pockets and portions of the Fermi surface centered at the
X
= (
π
, 0) and
Y
= (0,
π
) points. This resembles results for iron-based superconductors but has a fundamental difference with iron pnictides and selenides. Moreover, our present efforts also suggest La
3
Ni
2
O
7
is qualitatively different from infinite-layer nickelates and cuprate superconductors.
Recently superconductivity with
T
c
of about 80 K was discovered in a bilayer nickelate La
3
Ni
2
O
7
under high pressure. Here the authors report a density functional theory and random phase approximation study of structural and electronic properties as a function of pressure and discuss the pairing mechanism.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
