Surface terminations and layer-resolved tunneling spectroscopy of the 122 iron pnictide superconductors

Li, Ang; Yin, Jia-Xin; Wang, Jihui; Wu, Zheng; Ma, Jihua; Sefat, Athena Safa; Sales, Brian C.; Mandrus, David; McGuire, Michael A.; Jin, Rongying; Zhang, Chenglin; Dai, Pengcheng; Lv, Bing; Chu, Ching-Wu; Liang, Xuejin; Hor, P; Ting, C; Pan, Shuheng

doi:10.1103/physrevb.99.134520

Title: Surface terminations and layer-resolved tunneling spectroscopy of the 122 iron pnictide superconductors

Journal Article · Tue Apr 30 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.134520· OSTI ID:1561639

Li, Ang ^[1]; Yin, Jia-Xin ^[2]; Wang, Jihui ^[3]; Wu, Zheng ^[3]; Ma, Jihua ^[4];

^[5];

^[5]; Mandrus, David ^[5];

^[5]; Jin, Rongying ^[6]; Zhang, Chenglin ^[7]; Dai, Pengcheng ^[7]; Lv, Bing ^[8]; Chu, Ching-Wu ^[3]; Liang, Xuejin ^[2]; Hor, P ^[3]; Ting, C ^[3]; Pan, Shuheng ^[9]

Univ. of Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity; Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Microsystem and Information Technology
Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and Inst. of Physics
Univ. of Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity
Univ. of Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity; Boston College, Chestnut Hill, MA (United States). Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics & Astronomy
Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy
Univ. of Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity; Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Physics
Univ. of Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity; Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and Inst. of Physics; Chinese Academy of Sciences (CAS), Beijing (China). School of Physics; Chinese Academy of Sciences (CAS), Beijing (China). CAS Center for Excellence in Topological Quantum Computation; Songshang Lake Material Lab., Dongguan (China)

The surface terminations of 122-type alkaline earth metal iron pnictides AEFe₂As₂(AE=Ca,Ba) are investigated with scanning tunneling microscopy/spectroscopy. Cleaving these crystals at a cryogenic temperature yields a large majority of terminations with an atomically resolved (√2 × √2)R45 or 1 × 2 lattice, as well as a very rare termination of 1 × 1 lattice symmetry. By assessing the lattice registration and selective chemical marking, we identify these terminations as (√2 × √2)R45-reconstructed AE, 1 × 2-reconstructed As, and (√2 × √2)R45-reconstructed Fe surface layers, respectively. Layer-resolved tunneling spectroscopy on these terminating surfaces reveals a well-defined superconducting energy gap on the As terminations, while the gap features become weaker on the AE terminations and absent on the Fe terminations. The superconducting gap is hardly affected locally by the As or AE surface reconstructions. The definitive identification of the surface terminations and the associated spectroscopic signatures shed light on the necessary roles of As and the pnictogen-iron-pnictogen trilayer building block in iron-based superconductivity.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1561639

Alternate ID(s):: OSTI ID: 1509926

Journal Information:: Physical Review B, Vol. 99, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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