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TT: Fachverband Tiefe Temperaturen

TT 20: Focus Session: The Nickel Age of Superconductivity: Cuprates Reloaded or Something New?

TT 20.4: Hauptvortrag

Dienstag, 17. März 2020, 11:15–11:45, HSZ 03

Comparing the electronic structure and magnetism of hole doped Nickelate and Cuprate superconductorslate and Cuprate superconductors — •George Sawatzky, Mi Liang, Mona Berciu, Kateryna Foyevtsova, and Ilya Elfimov — Stuart Blusson Quantum Matter Institute Institute University of British Columbia Vancouver BC V6T1Z4,

Using the same theoretical methods used for the cuprates we investigate the electronic and magnetic structure and excitations of the new infinite layer NdNiO₂. We show that the nickelates are expected to be Mott Hubbard rather than charge transfer gap insulators provided that there are no other bands crossing the Fermi energy. In this case the much larger charge transfer energy will result in a strongly reduced superexchange interaction and also reduces the crystal field splittings of the d levels. This results in a near degeneracy of the triplet and singlet states for the hole doped nickelate . All these effects make the Nick=elates very different from the cuprates.