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TT: Fachverband Tiefe Temperaturen

TT 5: Nickelates I

TT 5.1: Vortrag

Montag, 18. März 2024, 09:30–09:45, H 3007

Theory of magnetic excitations in bilayer nickelate superconductor La₃Ni₂O₇ — •Steffen Bötzel, Frank Lechermann, Jannik Gondolf, and Ilya Eremin — Ruhr-Universität Bochum, theoretische Physik III, Bochum, Germany

Motivated by the recent reports of high-T_c superconductivity in La₃Ni₂O₇ under pressure, we analyzed theoretically the magnetic excitations in the normal and the superconducting state in this compound, which can be measured by inelastic neutron scattering. We show that the bilayer structure of the spin response allows to elucidate the role of the interlayer interaction and the Cooper-pairing in a very efficient way. In particular, we demonstrate the key difference between the potential s_± and d-wave gaps, discussed recently, by comparing the corresponding response in the even and odd channels of the spin susceptibility. We show that mostly interlayer driven s_± Cooper-pairing produces a single large spin resonance peak in the odd channel near the X point whereas several resonances are predicted for the d-wave scenario.

Keywords: Bilayer nickelate; La3Ni2O7; Magnetic resonance; Spin response; Unconventional superconductivity