Strong pinning in the hole-doped pnictide superconductor La0.34Na0.66Fe2As2
Strong pinning in the hole-doped pnictide superconductor La0.34Na0.66Fe2As2
We present magnetization studies as a function of time, temperature and magnetic field for $H$ $\parallel$ c-axis, in a hole-doped pnictide superconductor, La$_{0.34}$Na$_{0.66}$Fe$_2$As$_2$, with, $T_c$ $\approx$ 27 K. The obtained vortex phase-diagram shows that the magnetic irreversibility line is very close to the mean-field superconducting transition line, similar to the …