131 research outputs found
Phase diagrams on composition-spread FeTeSe films
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.Comment: 13 pages,5 figures and Supplementary Material 3 pages,3 figure
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