Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 52: Nickelates and Other Complex Oxides

TT 52.2: Talk

Friday, March 21, 2025, 09:45–10:00, H31

Theory of potential impurity scattering in pressurized superconducting La₃Ni₂O₇ — •Steffen Bötzel¹, Frank Lechermann¹, Takasada Shibauchi², and Ilya Eremin¹ — ¹Theoretische Physik III, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum — ²Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan

We study the effect of the point-like non-magnetic impurities on the superconducting state of La-327 and show that the interlayer s_±-wave and d-wave symmetries show a very different behavior as a function of impurity concentration, which can be studied experimentally by irradiating the La-327 samples by electrons prior applying the pressure. While d−wave superconducting state will be conventionally suppressed, the s_±-wave state shows more subtle behavior, depending on the asymmetry between bonding and antibonding subspaces. For the electronic structure, predicted to realize in La-327, the s_±−wave state will be robust against complete suppression and the transition temperature, T_c demonstrates a transition from convex to concave behavior, indicating a crossover from s_±-wave to s₊₊-wave symmetry as a function of impurity concentration. We further analyze the sensitivity of the obtained results with respect to the potential electronic structure modification.

Keywords: disorder; impurity scattering; La3Ni2O7; bilayer