Atomic-scale coexistence of short-range magnetic order and superconductivity in Fe1+ySe0.1Te0.9

Ramakrishna Aluru, Haibiao Zhou, Antoine Essig, J.-Ph. Reid, Vladimir Tsurkan, Alois Loidl, Joachim Deisenhofer, and Peter Wahl
Phys. Rev. Materials 3, 084805 – Published 19 August 2019
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Abstract

The ground state of the parent compounds of many high-temperature superconductors is an antiferromagnetically ordered phase, where superconductivity emerges when the antiferromagnetic phase transition is suppressed by doping or application of pressure. This behavior implies a close relation between the two orders. Examining the interplay between them promises a better understanding of how the superconducting condensate forms from the antiferromagnetically ordered background. Here we explore this relation in real space at the atomic scale using low-temperature spin-polarized scanning tunneling microscopy and spectroscopy. We investigate the transition from antiferromagnetically ordered Fe1+yTe via the spin-glass phase in Fe1+ySe0.1Te0.9 to superconducting Fe1+ySe0.15Te0.85. In Fe1+ySe0.1Te0.9 we observe an atomic-scale coexistence of superconductivity and short-ranged bicollinear antiferromagnetic order. However, a direct correlation between the two orders is not observed, supporting the scenario of s± superconducting symmetry in this material. Our work demonstrates a direct probe of the relation between the two orders, which is indispensable for our understanding of high-temperature superconductivity.

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  • Received 28 November 2017
  • Revised 26 April 2019

DOI:https://doi.org/10.1103/PhysRevMaterials.3.084805

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Ramakrishna Aluru1, Haibiao Zhou1, Antoine Essig1, J.-Ph. Reid1, Vladimir Tsurkan2,3, Alois Loidl2, Joachim Deisenhofer2, and Peter Wahl1,*

  • 1SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, United Kingdom
  • 2Center for Electronic Correlations and Magnetism, Experimental Physics V, University of Augsburg, D-86159 Augsburg, Germany
  • 3Institute of Applied Physics, Academy of Sciences of Moldova, MD 2028 Chisinau, Republic of Moldova

  • *wahl@st-andrews.ac.uk

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Issue

Vol. 3, Iss. 8 — August 2019

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