1. Department of Physics, Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
2. School of Materials Science and Engineering, Northeastern University, No 11, Lane 3, Wenhua Road, Heping District, Shenyang 110819, People's Republic of China
3. Laboratorio de Superconductividad, Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Ap. Postal 14–0149, Lima 15081, Peru
4. Laboratorio de Celdas Solares, Universidad Nacional de Barranca, Av. Toribio de Luzuriaga N°376, Mz J, Urbanización La Florida, Distrito y Provincia de Barranca 15169, Peru
5. Laboratorio de Ciencias, Universidad Nacional Autónoma de Tayacaja “Daniel Hernandez Morillo,” Jr., Bolognesi 418, Pampas 09156, Huancavelica, Peru