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

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.108.107002· OSTI ID:1042856

Thampy, Vivek ^[1]; Kang, Jian ^[2]; Rodriguez-Rivera, J A ^[3]; Bao, Wei ^[4]; Savici, Andrei T ^[1]; Hu, Jin ^[5]; Liu, Tijiang ^[5]; Qian, Bin ^[5]; Fobes, David ^[5]; Mao, Z Q ^[5]; Fu, Changbo ^[1]; Chen, W. C. ^[6]; Ye, Qiang ^[1]; Erwin, R ^[6]; Gentile, T. R. ^[6]; Tesanovic, Zlatko ^[1]; Broholm, Collin L ^[1]

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1. ORNL
2. Johns Hopkins University
3. NCNR and University of Maryland
4. Renmin University of China
5. Tulane University
6. National Institute of Standards and Technology (NIST)

Using polarized and unpolarized neutron scattering we show that interstitial Fe in superconducting Fe$$_{1+y}$$Te$$_{1-x}$$Se$$_x$$ induces a magnetic Friedel-like oscillation that diffracts at $${\bf Q}_{\perp}=(\frac{1}{2}0)$$ and involves $$>$$50 neighboring Fe sites. The interstitial $>2$$~$$\mu_B$$ moment is surrounded by compensating ferromagnetic four spin clusters that may seed double stripe ordering in Fe$$_{1+y}$$Te. A semi-metallic 5-band model with $$(\frac{1}{2}\frac{1}{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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1042856
• Journal Information: Physical Review Letters, Vol. 108, Issue 10; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
FERMI LEVEL
INTERSTITIALS
IRON SELENIDES
IRON TELLURIDES
NEUTRON DIFFRACTION
OSCILLATIONS
SCATTERING
SPIN
SUPERCONDUCTIVITY