Enhanced spin-ordering temperature in ultrathin FeTe films grown on a topological insulator

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  • Udai Raj Singh, Universitat Hamburg
  • ,
  • Jonas Warmuth, Universitat Hamburg
  • ,
  • Anand Kamlapure, Universitat Hamburg
  • ,
  • Lasse Cornils, Universitat Hamburg
  • ,
  • Martin Bremholm
  • Philip Hofmann
  • Jens Wiebe, Universitat Hamburg
  • ,
  • Roland Wiesendanger, Universitat Hamburg

We studied the temperature dependence of the diagonal double-stripe spin order in 1 and 2 unit cell thick layers of FeTe grown on the topological insulator Bi2Te3 via spin-polarized scanning tunneling microscopy. The spin order persists up to temperatures which are higher than the transition temperature reported for bulk Fe1+yTe with lowest possible excess Fe content y. The enhanced spin order stability is assigned to a strongly decreased y with respect to the lowest values achievable in bulk crystal growth, and effects due to the interface between the FeTe and the topological insulator. The result is relevant for understanding the recent observation of a coexistence of superconducting correlations and spin order in this system.

Original languageEnglish
Article number144513
JournalPhysical Review B
Number of pages6
Publication statusPublished - 20 Apr 2018

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