Effect of Surface Morphology and Magnetic Impurities on the Electronic Structure in Cobalt-Doped BaFe 2 As 2 Superconductors

Zou, Qiang; Wu, Zhiming; Fu, Mingming; Zhang, Chunmiao; Rajput, S.; Wu, Yaping; Li, Li; Parker, D. S.; Kang, Junyong; Sefat, A. S.; Gai, Zheng

doi:10.1021/acs.nanolett.6b04825

Title: Effect of Surface Morphology and Magnetic Impurities on the Electronic Structure in Cobalt-Doped BaFe ₂ As ₂ Superconductors

Journal Article · Fri Feb 03 00:00:00 EST 2017 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.6b04825· OSTI ID:1342685

Zou, Qiang; Wu, Zhiming; Fu, Mingming; Zhang, Chunmiao; Rajput, S.; Wu, Yaping; Li, Li; Parker, D. S.; Kang, Junyong; Sefat, A. S.;

Combined scanning tunneling microscopy, spectroscopy, and local barrier height (LBH) studies show that low-temperature-cleaved optimally doped Ba(Fe_1–xCo_x)₂As₂ crystals with x = 0.06, with T_c = 22 K, have complicated morphologies. Although the cleavage surface and hence the morphologies are variable, the superconducting gap maps show the same gap widths and nanometer size inhomogeneities irrelevant to the morphology. Based on the spectroscopy and LBH maps, the bright patches and dark stripes in the morphologies are identified as Ba- and As-dominated surface terminations, respectively. Magnetic impurities, possibly due to Co or Fe atoms, are believed to create local in-gap state and, in addition, suppress the superconducting coherence peaks. Lastly, this study will clarify the confusion on the cleavage surface terminations of the Fe-based superconductors and its relation with the electronic structures.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1342685

Journal Information:: Nano Letters, Vol. 17, Issue 3; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe _0.957 Co _0.043 ) ₂ As ₂ Carpenter, M. A.; Evans, D. M.; Schiemer, J. A. Journal of Physics: Condensed Matter, Vol. 31, Issue 15 https://doi.org/10.1088/1361-648x/aafe29	journal	February 2019
Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe0.957Co0.043)₂As₂ Carpenter, M. A.; Evans, D. M.; Schiemer, J. A. Karlsruhe https://doi.org/10.5445/ir/1000092129	text	January 2019
Lattice disorder effect on magnetic ordering of iron arsenides Sefat, Athena S.; Wang, Xiaoping P.; Liu, Yaohua Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-56301-5	journal	December 2019

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