1. Innovative Materials and Devices, CNR-SPIN Institute for Superconductors, Corso Perrone 24, I-16152 Genova, Italy
2. Física Teórica de la Materia Condensada-IFIMAC, Universidad Autonoma de Madrid, E-28049 Madrid, Spain
3. Dipartimento di Fisica, Universita degli Studi di Genova, via Dodecaneso 33, 16146 Genova, Italy
4. Materials Characterization Facility, Istituto Italiano di Tecnologia, Via Morego 30, I-16163 Genova, Italy
5. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91104, United States
6. University Rennes, CNRS, IPR (Institut de Physique de Rennes)—UMR 6251, F-35000 Rennes, France
7. Instituto de Ciencia de Materiales de Madrid-CSIC, Cantoblanco, E-28049 Madrid, Spain