Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.037003
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Funding
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-AC02-76SF00515]
- NSF [DMR-1205469]
- LA-SiGMA program [EPS-1003897]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1205469] Funding Source: National Science Foundation
- Office Of The Director
- EPSCoR [1003897] Funding Source: National Science Foundation
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The nature of metallicity and the level of electronic correlations in the antiferromagnetically ordered parent compounds are two important open issues for the iron-based superconductivity. We perform a temperature-dependent angle-resolved photoemission spectroscopy study of Fe1.02Te, the parent compound for iron chalcogenide superconductors. Deep in the antiferromagnetic state, the spectra exhibit a peak-dip-hump line shape associated with two clearly separate branches of dispersion, characteristics of polarons seen in manganites and lightly doped cuprates. As temperature increases towards the Neel temperature (T-N), we observe a decreasing renormalization of the peak dispersion and a counterintuitive sharpening of the hump linewidth, suggestive of an intimate connection between the weakening electron-phonon (e-ph) coupling and antiferromagnetism. Our finding points to the highly correlated nature of the Fe1.02Te ground state featured by strong interactions among the charge, spin, and lattice and a good metallicity plausibly contributed by the coherent polaron motion. DOI: 10.1103/PhysRevLett.110.037003
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