Experimental study reveals enhanced critical current density in epitaxial Fe–Te–Se films on calcium fluoride, indicating strong vortex pinning for high-field superconducting applications.
Epitaxial Fe?Te?Se thin films were deposited by pulsed laser deposition at 250?600??C on SrTiO3 (100), MgO (100), LaAlO3 (100) and CaF2 (100) single crystal substrates. The best superconducting film was grown on CaF2: ?K and ?K with Tdep?=?300??C and 3?Hz. Critical current density Jc (T?=?4.2?K) was 0.41???106?A?cm?2 at 0?T and 0.23???106?A?cm?2 at 9?T. The angular dependence of Jc shows a broad c-axis correlated peak when B???3?T.
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Mele et al. (2012) studied this question.
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