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We report on the Pt doping effect on surface and electronic structure inIr$_{\mathrm{1-x}}$Pt$_{\mathrm{x}}$Te$_ {\mathrm{2}}$ by scanning tunnelingmicroscopy (STM) and spectroscopy (STS). The surface prepared by cleavage at4.2 K shows a triangular lattice of topmost Te atoms. The compounds thatundergo structural transition have supermodulation with a fixed wave vector $q= \frac{2\pi}{5a_m}$ (where $a_m$ is the lattice constant in the monoclinicphase) despite the different Pt concentrations. The superconducting compoundsshow patch structures. The surface of the compound that exhibits neither thesuperconductivity nor the structural transition shows no superstructure. In alldoped samples, the dopant is observed as a dark spot in STM images. Thetunneling spectra near the dopant show the change in the local density of stateat approximately -200 mV. Such microscopic effects of the dopant give us thekeys for establishing a microscopic model of this material.

Visualizing the Pt doping effect on surface and electronic structure in Ir_{1-x}Pt_{x}Te_{2} by scanning tunneling microscopy and spectroscopy