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Distinct Fermi Surface Topology and Nodeless Superconducting Gap in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi>Tl</mml:mi><mml:mn>0.58</mml:mn></mml:msub><mml:msub><mml:mi>Rb</mml:mi><mml:mn>0.42</mml:mn></mml:msub><mml:mo stretchy="false">)</mml:mo><mml:msub><mml:mi>Fe</mml:mi><mml:mn>1.72</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Superconductor
High resolution angle-resolved photoemission measurements have been carried out to study the electronic structure and superconducting gap of the $({\mathrm{Tl}}_{0.58}{\mathrm{Rb}}_{0.42}){\mathrm{Fe}}_{1.72}{\mathrm{Se}}_{2}$ superconductor with a ${T}_{c}=32\text{ }\text{ }\mathrm{K}$. The Fermi surface topology consists of two electronlike Fermi surface sheets around the $\ensuremath{\Gamma}$ point which is distinct from that in all other iron-based …