Superconductivity and band structure of layered AuSn$_4$

Herrera, Edwin; Wu, Beilun; O’Leary, Evan; Ruiz, Alberto M.; Águeda, Miguel; García, Talavera, Pablo; Barrena, Víctor; Azpeitia, Jon; Garcia-Hernandez, M.; Wang, Lin-Lin; Kaminski, Adam; Canfield, Paul C.; Baldoví, José J.; Suderow, Hermann

doi:10.48550/arxiv.2205.09975

Cited by 2 publications

(4 citation statements)

References 79 publications

(111 reference statements)

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“…In the present article, the spotlight is on the first principle topological study of AuSn 4 , which is recently found to show some glimpse of superconductivity with topological non-trivial character [34]. Superconductivity in AuSn 4 was discovered a long time ago [35], but the system remained unexplored till date.…”

Section: Introductionmentioning

confidence: 94%

Non-trivial band topology in the superconductor AuSn₄: a first principle study

Karn

Sharma

Awana

2022

Supercond. Sci. Technol.

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Topological semimetals such as Weyl or Dirac semimetal with superconductivity have emerged as a new class of topological materials to realize and study Majorana Fermion in its intrinsic form. This article reports the Density Functional Theory (DFT) calculated bulk electronic band structure of recently discovered topological superconductor candidate Sn4Au. This study is further extended to the calculation of Z2 invariants. The Fermi surfaces corresponding to the bands which are responsible for non-trivial band topology along with the surface states are also mapped. The complete study suggests that Sn4Au is a topological semimetal. On Sn4Au, it is the first report in the literature showing the non-trivial band topology based on first-principle calculations.

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Section: Introductionmentioning

confidence: 94%

Non-trivial band topology in the superconductor AuSn₄: a first principle study

Karn

Sharma

Awana

2022

Supercond. Sci. Technol.

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“…Sn 4 Au also lie in category of TSMs based on available theoretical reports [25,26], while experimental confirmation of the same by various physical property measurements is yet to be done. On this front, Sn 4 Au has been reported to exhibit some interesting superconducting and normal state properties [20,27]. The low temperature magnetoconductivity (MC) of Sn 4 Au in its normal state, is seemingly contributed by TSS as shown in [20].…”

Section: Introductionmentioning

confidence: 99%

“…The low temperature magnetoconductivity (MC) of Sn 4 Au in its normal state, is seemingly contributed by TSS as shown in [20]. The exotic properties of Sn 4 Au inspire one to study more about its superconducting and normal state properties and to compare with only available reports [20,27], as well to further extend the analysis. In current article not only the available experimental results [20,27] are reproduced but further the normal state angle dependent magneto transport is included and thus the presence of normal state topology along with low temperature superconductivity is ascertained.…”

Section: Introductionmentioning

confidence: 99%

“…The exotic properties of Sn 4 Au inspire one to study more about its superconducting and normal state properties and to compare with only available reports [20,27], as well to further extend the analysis. In current article not only the available experimental results [20,27] are reproduced but further the normal state angle dependent magneto transport is included and thus the presence of normal state topology along with low temperature superconductivity is ascertained. Besides, our magneto transport studies in superconducting regime conclude the Sn 4 Au to be a type-I superconductor instead of type-II as concluded from magnetization measurements in [20].…”

Section: Introductionmentioning

confidence: 99%

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Probing the topological surface states in superconducting Sn₄Au single crystal: a magneto transport study

Sharma

Rani

Awana

2022

J. Phys.: Condens. Matter

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Materials exhibiting bulk superconductivity along with magnetoresistance (MR) in their normal state have emerged as suitable candidates for topological superconductivity. In this article, we report a flux free method to synthesize single crystal of topological superconductor candidate Sn4Au. The phase purity and single crystalline nature are confirmed through various characterizations viz. X-Ray diffraction (XRD), field emission scanning electron microscopy (FESEM), selected Area electron diffraction (SAED), and transmission electron microscopy (TEM). Chemical states of the constituent element viz. Sn and Au are analyzed through X-Ray photoelectron spectroscopy (XPS). Superconductivity in synthesized Sn4Au single crystal is evident form -T plot and critical field (Hc) is determined through -H plot at 2K i.e., just below critical temperature Tc. A positive magnetoresistance (MR) is observed in -H measurements at different temperatures above Tc, viz. at 3K, 5K, 10K and 20K. Further, the magnetoconductivity (MC) is analyzed by using Hikami-Larkin-Nagaoka (HLN) formalism, which signifies the presence of weak antilocalization (WAL) effect in Sn4Au. Angle dependent magneto-transport measurement has been performed to detect the origin of observed WAL effect in Sn4Au single crystal. Normalized MC vs Hcosplot shows presence of topological surface states (TSS) in the studied system. It is evident that Sn4Au is a 2.6K topological superconductor.

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Superconductivity and band structure of layered AuSn$_4$

Cited by 2 publications

References 79 publications

Non-trivial band topology in the superconductor AuSn₄: a first principle study

Non-trivial band topology in the superconductor AuSn₄: a first principle study

Probing the topological surface states in superconducting Sn₄Au single crystal: a magneto transport study

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Superconductivity and band structure of layered AuSn$_4$

Cited by 2 publications

References 79 publications

Non-trivial band topology in the superconductor AuSn4: a first principle study

Non-trivial band topology in the superconductor AuSn4: a first principle study

Probing the topological surface states in superconducting Sn4Au single crystal: a magneto transport study

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Product

Resources

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Non-trivial band topology in the superconductor AuSn₄: a first principle study

Non-trivial band topology in the superconductor AuSn₄: a first principle study

Probing the topological surface states in superconducting Sn₄Au single crystal: a magneto transport study