Experimental study demonstrates enhanced upper critical fields in epitaxial FeTe0.8S0.2 thin films, suggesting high potential for high-field magnet applications.
Epitaxial Fe?Te?S thin films (thickness range 100?200?nm) were deposited by pulsed laser deposition at 400??C on SrTiO3(100) and MgO(100) single-crystal substrates. The films reached the zero-resistance condition: Tc0 = 3.54?K for on SrTiO3 and 5.37?K for on MgO, and presented a large upper critical field: ?T for on SrTiO3 and 74.2?T for on MgO, using 90% of the normal state resistance and the Werthamer?Helfand?Hohenberg model. The coherence length ?0 is very short: 2.30?nm for on SrTiO3 and 2.10?nm for on MgO. The film grown on MgO showed ?T; then the isotropic parameter ? is 1.09. The best Jc observed is 104?A?cm ? 2 (at 2?K, self-field) for the sample deposited on MgO.
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Mele et al. (2010) studied this question.
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