Magnetic penetration depth and Tc in superconducting nickelates

Fabio Bernardini (1) , Valerio Olevano (2) , Andrés Cano (2)

1 UniCa - Università degli Studi di Cagliari = University of Cagliari
2 NEEL - TMC - Théorie de la Matière Condensée

We compute the nominal magnetic penetration depth of RNiO2 (R = La, Nd) from first principles calculations and discuss the results in relation to the superconducting Tc. We find a marked discrepancy with the well established phenomenology that correlates these two quantities in cuprates (Uemura plot). We also consider the 2D ultrathin limit and estimate the maximum attainable Tc to be ∼ 180 K according to the Nelson-Kosterliz universal relation between the superfluid density and the transition temperature.

Domaines: Autre [cond-mat.other]; Science des matériaux [cond-mat.mtrl-sci]

Fabio Bernardini, Valerio Olevano, Andrés Cano. Magnetic penetration depth and Tc in superconducting nickelates. Physical Review Research, 2020, 2 (1), pp.013219. ⟨10.1103/PhysRevResearch.2.013219⟩. ⟨hal-03357509⟩