Friedel-like oscillations from interstitial Iron in superconducting Fe 1+yTe 0.62Se 0.38

V. Thampy, J. Kang, J. A. Rodriguez-Rivera, W. Bao, A. T. Savici, J. Hu, T. J. Liu, B. Qian, D. Fobes, Z. Q. Mao, C. B. Fu, W. C. Chen, Q. Ye, R. W. Erwin, T. R. Gentile, Z. Tesanovic, C. Broholm

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43 Scopus citations

Abstract

Using polarized and unpolarized neutron scattering, we show that interstitial Fe in superconducting Fe 1+yTe 1-xSe x induces a magnetic Friedel-like oscillation that diffracts at Q=(120) and involves >50 neighboring Fe sites. The interstitial >2μ B moment is surrounded by compensating ferromagnetic four-spin clusters that may seed double stripe ordering in Fe 1+yTe. A semimetallic five-band model with (1212) Fermi surface nesting and fourfold symmetric superexchange between interstitial Fe and two in-plane nearest neighbors largely accounts for the observed diffraction.

Original languageEnglish (US)
Article number107002
JournalPhysical review letters
Volume108
Issue number10
DOIs
StatePublished - Mar 7 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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