Superconducting and Topological Properties in Centrosymmetric PbTaS<sub>2</sub> Single Crystals

Gao, Jun; G., J.; Luo, X.; Yan, Jian; Jiang, Zheng; Wang, W.; Xu, Chunqiang; Xu, Xiaofeng; Tong, P.; Song, Wenhai; Zhu, Xuebin; Lu, W. J.; Sun, Young

doi:10.1021/acs.jpcc.0c00527

Cited by 20 publications

(22 citation statements)

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“…2(f), which exhibits an upward curvature. Similar features were reported in PbTaSe 2 37 and PbTaS 2 32 , in which the upward feature was roughly fitted by…”

Section: Resultssupporting

confidence: 81%

“…The zoomin figure in the inset of Fig. 2(a) shows a sharp superconducting transition, T 50% c of which determined at the half value of the normal state resistivity is around 2.8 K, higher than 2H-TaS 2 (T c = 0.8 K) 36 and PbTaS 2 (T c = 2.6 K) 32 . Fig.…”

Section: Resultsmentioning

confidence: 91%

“…Although many candidates of NLSMs have been proposed, experimental realizations of NLSMs are still relatively scarce 17,49 . One of the biggest challenges is that the most of the NLSMs theoretically predicted are fragile to SOC (e.g., PbTaS 2 32 and SnTaS 2 33 ). In our study, we have proposed a new TCM Pb 1/3 TaS 2 hosting nodalline structures, which remain stable even under significant SOC by virtue of the nonsymmorphic symmetry protection, and hence can be observed in a realistic experiment.…”

Section: Discussionmentioning

confidence: 99%

“…PbTaSe 2 is also a typical NLSM where the nodal lines are guaranteed by mirror symmetry 8 . A different group of 112 systems with centrosymmetric lattices, e.g., PbTaS 2 32 and SnTaS 2 33 , in which the nodal lines are protected by the PT symmetry instead, without the account of SOC. Nevertheless, nodal lines in the centrosymmetric 112 systems receive no nonsymmorphic protection and thus cannot survive under the strong SOC 33 .…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic superconductivity in topological crystalline metal Pb$_{1/3}$TaS$_2$ with multiple Dirac fermions

Yang,

Yu,

et al. 2021

Preprint

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Topological crystalline metals/semimetals (TCMs) have stimulated a great research interest, which broaden the classification of topological phases and provide a valuable platform to explore topological superconductivity. Here, we report the discovery of superconductivity and topological features in Pb-intercalated transition-metal dichalcogenide Pb 1/3 TaS2. Systematic measurements indicate that Pb 1/3 TaS2 is a quasi-two-dimensional (q-2D) type-II superconductor (Tc ≈ 2.8 K) with a significantly enhanced anisotropy of upper critical field (γH c2 = H ab c2 /H c c2 ≈ 17). In addition, first-principles calculations reveal that Pb 1/3 TaS2 hosts multiple topological Dirac fermions in the electronic band structure. We discover four groups of Dirac nodal lines on the kz = π plane and two sets of Dirac points on the rotation/screw axes, which are protected by crystalline symmetries and robust against spin-orbit coupling (SOC). Dirac-cone-like surface states emerge on the (001) surface because of band inversion. Our work shows that the TCM candidate Pb 1/3 TaS2 is a promising arena to study the interplay between superconductivity and topological Dirac fermions.

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“…2(f), which exhibits an upward curvature. Similar features were reported in PbTaSe 2 37 and PbTaS 2 32 , in which the upward feature was roughly fitted by…”

Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anisotropic superconductivity in topological crystalline metal Pb$_{1/3}$TaS$_2$ with multiple Dirac fermions

Yang,

Yu,

et al. 2021

Preprint

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“…Previously, the NLSM superconductor has been studied intensively [9,10,[34][35][36][37][38][39][40][41][42][43][44][45]. In the superconducting state, the single-band inversion naturally becomes the double band inversion due to the particle-hole symmetry.…”

Section: Introductionmentioning

confidence: 99%

Fragile topology in nodal-line semimetal superconductors

Wang,

Zhou

2021

Preprint

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We study the topological properties of the nodal-line semimetal superconductor. The single band inversion and the double band inversion coexist in an s-wave nodal-line semimetal superconductor. In the single/double band inversion region, the system is in a stable/fragile topological state. The two topological invariants describing these two topological states are coupled to each other, leading to the coupled edge states. The stable topological state is indexed by Z(d=1), while the fragile topological state is characterized to be Z ⊗ Z(d = 1). In addition, the s-wave nodal-line semimetal superconductor has a nontrivial Z4 = 2 topological invariant, indicating that it is a inversion symmetry protected second order topological crystalline superconductor. While the p-wave nodal-line semimetal belongs to a pure fragile topological superconductor due to the double band inversion. The vortex bound states and the surface impurity effects are studied and they can be used to distinguish the different pairing states and identify the fragile topology of the system. Remarkably, we propose that vortex line in the nodal-line semimetal superconductor is a one dimensional fragile topological state protected by the spatial symmetry.

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The Coexistence of Superconductivity and Topological Order in Van der Waals InNbS₂

Zheng,

Feng,

Liu

et al. 2023

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The research on systems with coexistence of superconductivity and nontrivial band topology has attracted widespread attention. However, the limited availability of material platforms severely hinders the research progress. Here, it reports the first experimental synthesis and measurement of high‐quality single crystal van der Waals transition‐metal dichalcogenide InNbS2, revealing it as a topological nodal line semimetal with coexisting superconductivity. The temperature‐dependent measurements of magnetization susceptibility and electrical transport show that InNbS2 is a type‐II superconductor with a transition temperature Tc of 6 K. First‐principles calculations predict multiple topological nodal ring states close to the Fermi level in the presence of spin–orbit coupling. Similar features are also observed in the as‐synthesized BiNbS2 and PbNbS2 samples. This work provides new material platforms ANbS2 (A = In, Bi, and Pb) and uncovers their intriguing potential for exploring the interplay between superconductivity and band topology.

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Superconducting and Topological Properties in Centrosymmetric PbTaS₂ Single Crystals

Cited by 20 publications

References 50 publications

Anisotropic superconductivity in topological crystalline metal Pb$_{1/3}$TaS$_2$ with multiple Dirac fermions

Anisotropic superconductivity in topological crystalline metal Pb$_{1/3}$TaS$_2$ with multiple Dirac fermions

Fragile topology in nodal-line semimetal superconductors

The Coexistence of Superconductivity and Topological Order in Van der Waals InNbS₂

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Superconducting and Topological Properties in Centrosymmetric PbTaS2 Single Crystals

Cited by 20 publications

References 50 publications

Anisotropic superconductivity in topological crystalline metal Pb$_{1/3}$TaS$_2$ with multiple Dirac fermions

Anisotropic superconductivity in topological crystalline metal Pb$_{1/3}$TaS$_2$ with multiple Dirac fermions

Fragile topology in nodal-line semimetal superconductors

The Coexistence of Superconductivity and Topological Order in Van der Waals InNbS2

Contact Info

Product

Resources

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Superconducting and Topological Properties in Centrosymmetric PbTaS₂ Single Crystals

The Coexistence of Superconductivity and Topological Order in Van der Waals InNbS₂