Strain-stabilized (π,π) order at the surface of Fe1+xTe

Chi Ming Yim*, Soumendra Panja, Christopher Trainer, Craig Topping, Christoph Heil, Alexandra Gibbs , Oxana Magdysyuk, Vladimir Tsurkan, Alois Loidl, Andreas W. Rost, Peter Wahl*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
1 Downloads (Pure)


A key property of many quantum materials is that their ground state depends sensitively on small changes of an external tuning parameter, e.g., doping, magnetic field, or pressure, creating opportunities for potential technological applications. Here, we explore tuning of the ground state of the nonsuperconducting parent compound, Fe1+xTe, of the iron chalcogenides by uniaxial strain. Iron telluride exhibits a peculiar (π, 0) antiferromagnetic order unlike the (π, π) order observed in the Fe-pnictide superconductors. The (π, 0) order is accompanied by a significant monoclinic distortion. We explore tuning of the ground state by uniaxial strain combined with low-temperature scanning tunneling microscopy. We demonstrate that, indeed under strain, the surface of Fe1.1Te undergoes a transition to a (π, π)-charge-ordered state. Comparison with transport experiments on uniaxially strained samples shows that this is a surface phase, demonstrating the opportunities afforded by 2D correlated phases stabilized near surfaces and interfaces.
Original languageEnglish
Pages (from-to)2786-2792
Number of pages7
JournalNano Letters
Issue number7
Early online date2 Apr 2021
Publication statusPublished - 14 Apr 2021


  • Uniaxial strain
  • Iron telluride
  • Low-temparature scanning tunneling microscopy
  • Charge order


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