Possible liquid-nitrogen-temperature superconductivity driven by perpendicular electric field in the single-bilayer film of La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> at ambient pressure.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41484099.
- Also identified by DOI 10.1038/s41467-025-67880-5 and PMC identifier 12855812.
- Licence recorded as CC BY-NC-ND.
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Abstract
Recently, high-temperature superconductivity (HTSC) is found in the La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub>/SrLaAlO<sub>4</sub> ultrathin film with critical temperature T<sub>c</sub> above the McMillan limit at ambient pressure (AP). It is eager to enhance T<sub>c</sub> of La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> at AP. We propose that a perpendicular electric field strongly enhances T<sub>c</sub> in the single-bilayer film of La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> at AP. Under electric field, the layer with lower potential energy will accept electrons flowing from the other layer to fill in the Ni- <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>3</mn> <msub><mrow><mi>d</mi></mrow> <mrow> <msup><mrow><mi>x</mi></mrow> <mrow><mn>2</mn></mrow> </msup> <mo>-</mo> <msup><mrow><mi>y</mi></mrow> <mrow><mn>2</mn></mrow> </msup> </mrow> </msub> </math> orbitals, as the nearly half-filled Ni- <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>3</mn> <msub><mrow><mi>d</mi></mrow> <mrow> <msup><mrow><mi>z</mi></mrow> <mrow><mn>2</mn></mrow> </msup> </mrow> </msub> </math> orbital cannot accommodate more electrons. With the enhancement of the filling fraction in the <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>3</mn> <msub><mrow><mi>d</mi></mrow> <mrow> <msup><mrow><mi>x</mi></mrow> <mrow><mn>2</mn></mrow> </msup> <mo>-</mo> <msup><mrow><mi>y</mi></mrow> <mrow><mn>2</mn></mrow> </msup> </mrow> </msub> </math> orbitals in this layer, the interlayer s-wave pairing is suppressed, but the intralayer d-wave pairing in this layer is strongly enhanced. We numerically verify this idea and yield that an imposed voltage of about 0.1 ~ 0.2 volt between layers is enough to realize liquid-nitrogen-temperature HTSC in this single bilayer at AP. Our results appeal for experimental verification.