Authors: A Llordés; A Palau; J Gázquez; M Coll; R Vlad; A Pomar; J Arbiol; R Guzmán; S Ye; V Rouco; F Sandiumenge; S Ricart; T Puig; M Varela; D Chateigner; J Vanacken; J Gutiérrez; V Moshchalkov; G Deutscher; C Magen; X Obradors Journal: Nat Mater Date: 2012-02-12 Impact factor: 43.841