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

Published

March 7, 2012

Author(s)

V. Thampy, J. Kang, Jose Rodriguez Rivera, 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 Erwin, Thomas R. Gentile, Z. Tesanovic, Collin L. Broholm

Abstract

Using polarized and unpolarized neutron scattering we show that interstital Fe in superconducting Fe_1=yTe_1-xSe_x 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.

Citation

Physical Review Letters

Volume

108

Issue

10

Pub Type

Journals

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Keywords

superconductor, pnictide, Friedel-oscillation, interstitial-iron

Citation

Thampy, V. , Kang, J. , Rodriguez Rivera, J. , Bao, W. , Savici, A. , Hu, J. , Liu, T. , Qian, B. , Fobes, D. , Mao, Z. , Fu, C. , Chen, W. , Ye, Q. , Erwin, R. , Gentile, T. , Tesanovic, Z. and Broholm, C. (2012), Friedel-like Oscillations from Interstitial Iron in Superconducting Fe_1+yTe_0.62Se_0.38, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909786 (Accessed October 14, 2025)