Band structure, superconductivity, and polytypism in AuSn4

Herrera, Edwin; Wu, Beilun; O'Leary, Evan; Ruiz, Alberto M.; Águeda, Miguel; Talavera, Pablo García; Barrena, Víctor; Azpeitia, Jon; Munuera, Carmen; García-Hernández, Mar; Wang, Lin-Lin; Kaminski, Adam; Canfield, Paul C.; Baldoví, José J.; Guillamón, Isabel; Suderow, Hermann

doi:10.1103/physrevmaterials.7.024804

Title: Band structure, superconductivity, and polytypism in AuSn₄

Journal Article · 12 February 2023 · Physical Review Materials

DOI: https://doi.org/10.1103/physrevmaterials.7.024804 · OSTI ID:1992671

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Universidad Autónoma de Madrid (Spain). Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC); Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain)
Ames Lab., and Iowa State Univ., Ames, IA (United States)
Univ. of Valencia (Spain)
Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Inst. de Ciencia de Materiales de Madrid, Cantoblanco

The orthorhombic compound AuSn₄ is compositionally similar to the Dirac node arc semimetal PtSn₄. AuSn₄ is, contrary to PtSn₄, superconducting with a critical temperature of T_c = 2.35 K. Recent measurements present indications for quasi-two-dimensional superconducting behavior in AuSn₄. Here we present measurements of the superconducting density of states and the band structure of AuSn₄ through scanning tunneling microscopy and angular resolved photoemission spectroscopy (ARPES). The superconducting gap values in different portions of the Fermi surface are spread around Δ₀ = 0.4 meV, which is close to but somewhat larger than Δ = 1.76k_BT_c expected from BCS theory. We observe superconducting features in the tunneling conductance at the surface up to temperatures about 20% larger than bulk T_c. The band structure calculated with density functional theory follows well the results of ARPES. The crystal structure presents two possible stackings of Sn layers, giving two nearly degenerate polytypes. This makes AuSn₄ a rather unique case with a three-dimensional electronic band structure but properties ressembling those of low-dimensional layered compounds.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1992671

Alternate ID(s):: OSTI ID: 1924345

Report Number(s):: IS-J--11,101

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 2 Vol. 7; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Band structure, superconductivity, and polytypism in AuSn4

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Title: Band structure, superconductivity, and polytypism in AuSn₄