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Friedel-like Oscillations from Interstitial Iron in Superconducting Fe1+yTe0.62Se0.38



V. Thampy, J. Kang, Jose A. Rodriguez, W. Bao, A. T. Savici, J. Hu, T. J. Liu, B. Qian, D. Fobes, Z. Q. Mao, C. B. Fu, WangChun Chen, Q. Ye, Ross W. Erwin, Thomas R. Gentile, Z. Tesanovic, Collin L. Broholm


Using polarized and unpolarized neutron scattering we show that interstital Fe in superconducting Fe1=yTe1-xSex induces a magnetic Friedel-like oscillation that idffracts at Q = (1⁄20) and involves {greater than}50 neighboring Fe sites. The interstitial {greater than} 2 υ} moment is surrounded by compensating ferromagnetic four spin clusters that may seed double stripe ordering in Fe^d1+yTe. A semi-metallic 5-band model with (1⁄21⁄2 Fermi surface nesting and four fold symmetric super-exchange between interstitial Fe and two in-plane nearest neighbors largely accounts for the observed diffraction.
Physical Review Letters


superconductor, pnictide, Friedel-oscillation, interstitial-iron
Created March 7, 2012, Updated February 19, 2017