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TT: Fachverband Tiefe Temperaturen
TT 5: Nickelates I
TT 5.13: Vortrag
Montag, 18. März 2024, 12:45–13:00, H 3007
Probing the pairing symmetry of superconducting nickelates through electron irradiation induced disorder — •Abhishek Ranna1, Michal Moravec1,2, Romain Grasset3, Kyuho Lee4, Bai Yang Wang4, Marcin Konczykowski3, Harold Y. Hwang4, Andrew P. Mackenzie1,2, and Berit H. Goodge1 — 1Max Planck Institute for Chemical Physics of Solids, Germany — 2University of St. Andrews, UK — 3LSI, Ecole Polytechnique, France — 4Stanford University, USA
Superconducting infinite-layer nickelates were experimentally realized two decades after their theoretical prediction, generating significant interest for being isoelectronic to the 3d9 superconducting cuprates. Despite similarities between their phase diagrams, key distinctions in electronic landscapes and hybridizations have been identified. Direct investigations to probe the fundamental superconducting properties using photoemission spectroscopy and single-particle tunneling experiments have so far proved challenging due to the thin film geometry and surface degradation caused during ex situ topotactic reduction. We employ high-energy electron irradiation to controllably and systematically induce disorder, thereby examining the impact of pair-breaking defects on the superconductivity which can help elucidate the nature of the superconducting gap symmetry. Here, we present our initial findings on the evolution of electronic properties such as the superconducting transition temperature and residual resistivity with increasing disorder to shed light on the pairing symmetry and electronic behaviour of the infinite-layer nickelates.
Keywords: unconventional superconductivity; infinite-layer nickelates; high-energy electron irradiation; pairing symmetry