Krzysztof Wohlfeld

Feb 9, 2024 | link.aps.org | Leonardo Martinelli |Dipartimento di Fisica |Politecnico di Milano |Krzysztof Wohlfeld

Abstract We have investigated the 3d orbital excitations in CaCuO2 (CCO), Nd2CuO4 (NCO), and La2CuO4 (LCO) using high-resolution resonant inelastic x-ray scattering. In LCO they behave as well-localized excitations, similarly to several other cuprates. On the contrary, in CCO and NCO the dxy orbital clearly disperses, pointing to a collective character of this excitation (orbiton) in compounds without apical oxygen.