Friedel-Like Oscillations from Interstitial Iron in Superconducting Fe1+yTe0.62Se0.38
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
DOI 10.1103/PhysRevLett.108.107002 · Physical Review Letters
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Abstract
Using polarized and unpolarized neutron scattering, we show that interstitial Fe in superconducting Fe1+yTe1−xSex induces a magnetic Friedel-like oscillation that diffracts at Q⊥=(120) and involves >50 neighboring Fe sites. The interstitial >2μB moment is surrounded by compensating ferromagnetic four-spin clusters that may seed double stripe ordering in Fe1+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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Fe1+yTe0.62Se0.38 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | unknown |
| Fe1+yTe0.62Se0.38 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | unknown |
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