Direct measurement of the temperature dependence of the magnetic penetration depth in Ba(Fe 1-x Ni x ) 2 As 2 superconductors

1. Rey, R.I.
2. Ramos-Álvarez, A.
3. Mosqueira, J.
4. Salem-Sugui Jr, S.
5. Alvarenga, A.D.
6. Luo, H.-Q.
7. Lu, X.-Y.
8. Zhang, R.
9. Vidal, F.