Nanoscale electronic inhomogeneity in FeSe0.4Te0.6 revealed through unsupervised machine learning

Peter Wahl, Udai R. Singh, Vladimir Tsurkan, Alois Loidl

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We report on an apparent low-energy nanoscale electronic inhomogeneity in FeSe0.4Te0.6 due to the distribution of selenium and tellurium atoms revealed through unsupervised machine learning. Through an unsupervised clustering algorithm, characteristic spectra of selenium- and tellurium-rich regions are identified. The inhomogeneity linked to these spectra can clearly be traced in the differential conductance and is detected both at energy scales of a few electron volts as well as within a few millielectronvolts of the Fermi energy. By comparison with ARPES, this inhomogeneity can be linked to an electron-like band just above the Fermi energy. It is directly correlated with the local distribution of selenium and tellurium. There is no clear correlation with the magnitude of the superconducting gap, however the height of the coherence peaks shows significant correlation with the intensity with which this band is detected, and hence with the local chemical composition.
Original languageEnglish
Article number115112
JournalPhysical Review. B, Condensed matter and materials physics
Volume101
Issue number11
DOIs
Publication statusPublished - 9 Mar 2020

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