Superconducting properties in a candidate topological nodal line semimetal 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SnTaS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
 with a centrosymmetric crystal structure

Chen, Dongyun; Wu, Yuelong; Jin, Lei; Li, Yongkai; Wang, Xiaoxiong; Duan, Junxi; Han, Junfeng; Li, Xiang; Long, Yun‐Ze; Zhang, Xiaoming; Chen, Dong; Teng, Bing

doi:10.1103/physrevb.100.064516

Cited by 41 publications

(46 citation statements)

References 49 publications

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“…Meanwhile, the anisotropic Majorana bound states were theoretically predicted and experimentally observed in 2M-WS2, which is a centrosymmetric superconductor with Tc ~ 8.8 K. [22,23]. SnTaS2 has also been identified to be a superconductor with a possible topological nodal line semimetal character [24]. Noteworthily, Z. H. Cui et al proposed that type-II Dirac semimetal states exist in the band structure of TaC [25].…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in centrosymmetric topological superconductor candidate TaC

Yan

Yang

Wang

et al. 2021

Supercond. Sci. Technol.

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We report the synthesis and physical properties of the single crystals of TaC, which are proposed to hold topological band structure as a topological superconductor (TSC) candidate. Magnetization, resistivity and specific heat measurements are performed and indicate that TaC is bulk superconductor with critical temperature of 10.3 K. TaC is a strongly coupled type-II superconductor and the superconducting state can be well described by s-wave Bardeen–Cooper–Schrieffer theory with a single gap. The upper critical field (H c2) of TaC shows linear temperature dependence, which is quite different from most conventional superconductors and isostructural NbC, which is proposed to manifest topological nodal-loops or type-II Dirac points as well as superconductivity. Our results suggest that TaC would be a new candidate for further research of TSCs.

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Section: Introductionmentioning

confidence: 99%

Superconductivity in centrosymmetric topological superconductor candidate TaC

Yan

Yang

Wang

et al. 2021

Supercond. Sci. Technol.

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“…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%

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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“…In recent years, spin gapless semiconductors (SGSs) and nodal ring states (NRSs) have attracted tremendous research interest in the condensed matter physics community due to their unique electronic band structures [1] , [2] , [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] , [22] , [23] , [24] , [25] , [26] . For SGSs, a gap is present in one spin channel, whereas the valence band maximum touches the conduction band minimum exactly at the Fermi level in the other spin channel, forming a gapless contact.…”

Section: Introductionmentioning

confidence: 99%