We find evidence that superconductivity intrudes into the paramagnetic-to-magnetic transition of the Kondo lattice model if magnetic frustration is added. Specifically, we study by the variational method the model on a square lattice in the presence of both nearest-neighbor (t) and next-nearest-neighbor (t�) hopping of the conduction electrons. We find that, when t�/t>0, a d-wave superconducting dome emerges between the magnetic and paramagnetic metal phases and close to the compensated regime, i.e., the number of conduction electrons equals the number of localized spin-1/2 moments. Superconductivity is further strengthened by a direct antiferromagnetic exchange, JH, between the localized moments, to such an extent that we observe coexistence with magnetic order. � 2014 American Physical Society.
|Titolo:||Superconductivity from spoiling magnetism in the Kondo lattice model|
|Autori:||Asadzadeh, M. Z.; Fabrizio, M.; Becca, F.|
|Rivista:||PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS|
|Data di pubblicazione:||2014|
|Digital Object Identifier (DOI):||10.1103/PhysRevB.90.205113|
|Appare nelle tipologie:||1.1 Journal article|