Phase diagrams on composition-spread FeTeSe films
arXiv:2208.01831 · doi:10.1016/j.scib.2022.06.015
Abstract
FeTeSe, an archetypical iron-based high-temperature superconductor with a simple structure but rich physical properties, has attracted lots of attention because the two end compositions, Se content and 1, exhibit antiferromagnetism and nematicity, respectively, making it an ideal candidate for studying their interactions with superconductivity. However, what is clearly lacking to date is a complete phase diagram of FeTeSe as functions of its chemical compositions since phase separation usually occurs from to 0.9 in bulk crystals. Moreover, fine control of its composition is experimentally challenging because both Te and Se are volatile elements. Here we establish a complete phase diagram of FeTeSe, achieved by high-throughput film synthesis and characterization techniques. An advanced combinatorial synthesis process enables us to fabricate an epitaxial composition-spread FeTeSe film encompassing the entire Se content from 0 to 1 on a single piece of CaF substrate. The micro-region composition analysis and X-ray diffraction show a successful continuous tuning of chemical compositions and lattice parameters, respectively. The micro-scale pattern technique allows the mapping of electrical transport properties as a function of relative Se content with an unprecedented resolution of 0.0074. Combining with the spin patterns in literature, we build a detailed phase diagram that can unify the electronic and magnetic properties of FeTeSe. Our composition-spread FeTeSe films, overcoming the challenges of phase separation and precise control of chemical compositions, provide an ideal platform for studying the relationship between superconductivity and magnetism.
arXiv comment13 pages,5 figures and Supplementary Material 3 pages,3 figures
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