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Measurement of Coherent Polarons in the Strongly Coupled Antiferromagnetically Ordered Iron-Chalcogenide Fe1.02Te using Angle-Resolved Photoemission Spectroscopy
- Source :
- Phys. Rev. Lett. 110, 037003 (2013)
- Publication Year :
- 2012
-
Abstract
- 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 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.<br />Comment: 5 pages, 4 figures. Accepted by prl
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 110, 037003 (2013)
- Publication Type :
- Report
- Accession number :
- edsarx.1212.4946
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.110.037003