Effective perpendicular electric field as a probe for interlayer pairing in ambient-pressure superconducting La2.85Pr0.15Ni2O7 thin films

Junkang Huang; Tao Zhou

doi:10.1103/rm9g-8lm1

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Effective perpendicular electric field as a probe for interlayer pairing in ambient-pressure superconducting La2.85Pr0.15Ni2O7 thin films

Junkang Huang, Tao Zhou

DOI 10.1103/rm9g-8lm1 · Physical Review B

T1

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Abstract

Recent angle-resolved photoemission spectroscopy (ARPES) experiments on La2.85Pr0.15Ni2O7 thin films revealed a superconducting gap near the diagonal direction for the dx2−y2 orbital, confined to a narrow momentum region. Our numerical calculations indicate that interlayer pairing is dominant, resulting in an s±-wave symmetry. We propose employing perpendicular electric fields, a practical method in thin-film systems, to verify the pairing symmetry. Our calculations predict that such fields will induce Fermi arcs or nodal points and significantly modulate the gap near the diagonal, with the modulated region overlapping the area probed by ARPES. This approach provides an effective tool for probing pairing symmetry in bilayer nickelate thin films, especially given current limitations in experimental techniques.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2.85Pr0.15Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure unresolved	onset
La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure unresolved	onset
La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	unknown
La2PrNi2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	82.5	Pressure not reported	unknown
La2SmNi2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	unknown