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Measurement of Coherent Polarons in the Strongly Coupled Antiferromagnetically Ordered Iron-Chalcogenide Fe1.02Te using Angle-Resolved Photoemission Spectroscopy

Authors :
Liu, Zhongkai
He, Ruihua
Lu, Donghui
Yi, Ming
Chen, Yulin
Hashimoto, Makoto
Moore, Robert G.
Mo, Sung-Kwan
Nowadnick, Elizabeth A.
Hu, Jin
Liu, Tijiang
Mao, Zhiqiang
Devereaux, Thomas P.
Hussain, Zahid
Shen, Zhi-Xun
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