Superconducting density of states and band structure at the surface of the candidate topological superconductor 
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Martín-Vega, Francisco; Herrera, Edwin; Wu, Beilun; Barrena, Víctor; Mompeán, F. J.; Garcı́a-Hernández, M.; Canfield, Paul C.; Black‐Schaffer, Annica M.; Baldoví, José J.; Guillamón, Isabel; Suderow, Hermann

doi:10.1103/physrevresearch.4.023241

Cited by 6 publications

(4 citation statements)

References 75 publications

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“…T c onset is found to be ∼3.2 K in the SC state of D3, which is comparatively less than the indium SC transition temperature T c critical ∼3.6 K. This crossover between the CL of SC and TCI is in accordance with niobium proximityinduced SC in SnTe thin film reported by Robin et al [17]. The temperature-dependent CL of device D3 is shown in the inset of figure 5(c), which also indicates the increase in the superconducting energy gap between Cooper pairs [45] with decreasing temperature. The extrapolated CL by GL fitting shows convergence across ∼3 K temperature.…”

Section: Discussionsupporting

confidence: 85%

“…Zhou et al [44] discussed the energy gap corresponding to the density of states (DOS) at the contact between normal metal and SC. Martin-Vega et al [45] showed that the superconducting energy gap increases with decreasing temperature. So, it is expected that proximity superconductivity would also be more dominant at low temperatures than at high temperatures due to an enhanced superconducting energy gap.…”

Section: Discussionmentioning

confidence: 99%

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Complex coincidence of superconducting and inverse proximity in quasi 2D nanostructured SnTe

Singh,

Saravanan,

Venkatesh

2023

Supercond. Sci. Technol.

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Inducing superconductivity in Topological insulators (TIs) and Topological crystalline insulators (TCI) is being investigated rigorously as a promising strategy to take the quantum spintronic applications to the next level. In this work, a complex interplay between topological and superconducting components is carefully tuned in such a way that an unusual coincidence of superconducting and inverse proximity is captured for the first time in electrical transport properties of Quasi 2-dimentional nanostructured SnTe contacted using “s-wave’’ superconducting electrodes. Ultralow temperature measurements in the complex superconducting proximity phase reveals two critical fields (Hc2) of 0.9T and 510 Oe. Lower Hc2 is identified to be from the superconducting electrode while the higher one is attributed to the Interface. The presence (absence) of coincidence between upper critical field (HC2) extracted from Ginzburg Landau (GL) theory and Werthamer Helfand Hohenberg (WHH) plot in normal (inverse) superconducting proximity region and concurrent crossover in correlation lengths ξ(T) and Lϕ(T) are observed to be the manifestation of robust competition between the mutual domination of different mechanisms such as topological surface states and cooper pair correlations. The current dependent MR measurements clearly demonstrate the dominant role played by an interplay between the superconducting correlations and spin-orbit coupling. Interestingly, mere doubling of contact area of superconductor is observed to simultaneously enhance the critical field to ~4 T and transition temperature to ~4.1 K in the interface region is assuring the possibility of opening-up a new gate way in nano-topological-superconducting- spintronic applications.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Complex coincidence of superconducting and inverse proximity in quasi 2D nanostructured SnTe

Singh,

Saravanan,

Venkatesh

2023

Supercond. Sci. Technol.

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“…To obtain the superconducting density of states N (E ) as a function of temperature, we deconvolute N (E ) from the tunneling conductance σ (V ), following Refs. [30,[41][42][43][44]…”

Section: A Scanning Tunneling Microscopy and Spectroscopymentioning

confidence: 99%

Band structure, superconductivity, and polytypism in AuSn4

Herrera

O’Leary

et al. 2023

Phys. Rev. Materials

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The orthorhombic compound AuSn 4 is compositionally similar to the Dirac node arc semimetal PtSn 4 . AuSn 4 is, contrary to PtSn 4 , superconducting with a critical temperature of T c = 2.35 K. Recent measurements present indications for quasi-two-dimensional superconducting behavior in AuSn 4 . Here we present measurements of the superconducting density of states and the band structure of AuSn 4 through scanning tunneling microscopy and angular resolved photoemission spectroscopy (ARPES). The superconducting gap values in different portions of the Fermi surface are spread around 0 = 0.4 meV, which is close to but somewhat larger than = 1.76k B T 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 AuSn 4 a rather unique case with a three-dimensional electronic band structure but properties ressembling those of low-dimensional layered compounds.

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“…It is highly urgent to search for more intrinsic TSC candidates with high superconducting critical temperature ( T c ) and topological surface states near E F . In recent, some strong candidates for TSC have been found in compounds formed by the IVA group elements and metals, such as AuSn 4 , [ 23 , 24 ] Au 2 Pb, [ 25 ] PtPb 4 , [ 26 ] Ta 3 (Sn, Pb), [ 27 ] BaSn 5 , [ 28 ] (Ta, Nb)RuSi, [ 29 ] and binary transition‐metal carbides (TMCs). [ 30 , 31 , 32 , 33 , 34 ] Among these TSCs, TMCs have a relatively high T c .…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in the High‐Entropy Ceramics Ti_0.2Zr_0.2Nb_0.2Mo_0.2Ta_0.2C_x with Possible Nontrivial Band Topology

Zeng,

Hu,

Zhou

et al. 2023

Advanced Science

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Topological superconductors have drawn significant interest from the scientific community due to the accompanying Majorana fermions. Here, the discovery of electronic structure and superconductivity (SC) in high‐entropy ceramics Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx (x = 1 and 0.8) combined with experiments and first‐principles calculations is reported. The Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx high‐entropy ceramics show bulk type‐II SC with Tc ≈ 4.00 K (x = 1) and 2.65 K (x = 0.8), respectively. The specific heat jump (∆C/γTc) is equal to 1.45 (x = 1) and 1.52 (x = 0.8), close to the expected value of 1.43 for the BCS superconductor in the weak coupling limit. The high‐pressure resistance measurements show a robust SC against high physical pressure in Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2C, with a slight Tc variation of 0.3 K within 82.5 GPa. Furthermore, the first‐principles calculations indicate that the Dirac‐like point exists in the electronic band structures of Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2C, which is potentially a topological superconductor. The Dirac‐like point is mainly contributed by the d orbitals of transition metals M and the p orbitals of C. The high‐entropy ceramics provide an excellent platform for the fabrication of novel quantum devices, and the study may spark significant future physics investigations in this intriguing material.

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Superconducting density of states and band structure at the surface of the candidate topological superconductor Au2Pb

Cited by 6 publications

References 75 publications

Complex coincidence of superconducting and inverse proximity in quasi 2D nanostructured SnTe

Complex coincidence of superconducting and inverse proximity in quasi 2D nanostructured SnTe

Band structure, superconductivity, and polytypism in AuSn4

Superconductivity in the High‐Entropy Ceramics Ti_0.2Zr_0.2Nb_0.2Mo_0.2Ta_0.2C_x with Possible Nontrivial Band Topology

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Superconducting density of states and band structure at the surface of the candidate topological superconductor Au2Pb

Cited by 6 publications

References 75 publications

Complex coincidence of superconducting and inverse proximity in quasi 2D nanostructured SnTe

Complex coincidence of superconducting and inverse proximity in quasi 2D nanostructured SnTe

Band structure, superconductivity, and polytypism in AuSn4

Superconductivity in the High‐Entropy Ceramics Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx with Possible Nontrivial Band Topology

Contact Info

Product

Resources

About

Superconductivity in the High‐Entropy Ceramics Ti_0.2Zr_0.2Nb_0.2Mo_0.2Ta_0.2C_x with Possible Nontrivial Band Topology