Structure and superconductivity of two different phases of Re<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>W

Biswas⃰, Pabitra Kumar; Lees, Martin R.; Hillier, A. D.; Smith, Ronald I.; Marshall, William G.; Paul, D. McK.

doi:10.1103/physrevb.84.184529

Cited by 50 publications

(56 citation statements)

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“…The H c2 (T ) curve shows a positive curvature close to T c and is linear thereafter. A similar behavior has also been observed in polycrystalline borocarbides [18], MgB 2 [19,20], Nb 0.18 Re 0.82 [21], and Re 3 W [22] and is considered as a signature of multi-gap superconductivity. A conventional Werthamer-HelfandHohenberg model can not describe H c2 (T ) of Bi 4 O 4 S 3 .…”

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confidence: 48%

Low superfluid density and possible multigap superconductivity in theBiS2-based layered superconductorBi4O4S3

et al. 2013

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The magnetic penetration depth λ as a function of temperature in Bi4O4S3 was studied by muon-spin-spectroscopy measurements. The superfluid density of Bi4O4S3 is found to be very low. The dependence of λ −2 on temperature possibly suggests the existence of two s-wave type energy gaps with the zero-temperature values of 0.93(3) and 0.09(4) meV. The upturn in the temperature dependence of the upper critical field close to Tc further supports multi-gap superconductivity in Bi4O4S3. The presence of two superconducting energy gaps is consistent with theoretical and other experimental studies. However, a single-gap s-wave model fit with a gap of 0.88(2) meV can not be ruled out completely. The value of λ(T ) at T = 0 K is estimated to be λ(0) = 861(17) nm, one of the largest of all known layered superconductors, reflecting a very low superfluid density.PACS numbers: 74.25.Ha, 76.75.+i Recent years have witnessed a growing interest in superconductivity within layered crystal structure compounds. The recent discovery of superconductivity in the BiS 2 -based compound Bi 4 O 4 S 3 [1, 2] with a transition temperature (T c ) of ≈ 4.5 K has further fostered the research interest in layered superconductors. Exotic superconductivity with higher T c and/or with unconventional pairing mechanism has often been found in materials with a layered crystal structure. In this context, the most familiar examples are the high-T c cuprates and the Fe-based superconductors, where the corresponding CuO 2 or Fe 2 An 2 (An = P, As, Se, Te) layer plays an important role in determining the superconducting properties [3][4][5]. Similarly, the BiS 2 layer is believed to be the basic building block for inducing superconductivity in Bi 4 O 4 S 3 and it is expected that the doping mechanism resembles that of cuprates and Fe-based superconductors. This argument is supported by the discovery of other BiS 2 -based superconductors ReO 1−x F x BiS 2 (Re = La, Ce, Pr, and Nd) with T c values of 10.6, 3.0, 5.5, and 5.6 K, respectively [6][7][8][9].Up to now, only very few theoretical and experimental studies have been performed on Bi 4 O 4 S 3 . The parent phase (Bi 6 O 8 S 5 ) is a band insulator which becomes superconducting after electron doping [1]. A first principles band structure calculation indicates that the superconductivity in Bi 4 O 4 S 3 originates from two Bi 6p orbitals, as they intersect the Fermi surface [10]. A RPA analysis of a two-orbital model for the BiS 2 -based superconductors suggests that the spin fluctuations promote competing A 1g and B 2g superconducting states with similar pairing strengths [11]. Transport measurements under pressure reveal that T c of Bi 4 O 4 S 3 decreases monotonically without distinct change of the normal state metallic behavior [12]. The exact nature of the superconducting state is still debated. Hall, Seebeck coefficients, and magnetoresistance measurements suggest exotic multiband features in Bi 4 O 4 S 3 [13]. Recent measurements of the temperature dependence of the magnetic penetration depth λ us...

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confidence: 48%

Low superfluid density and possible multigap superconductivity in theBiS2-based layered superconductorBi4O4S3

et al. 2013

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“…To date, it has been reported to be observed only in a few NCS materials: LaNiC 2 [24], Re 6 X (X = Zr, Hf) [25,26], Re 24 Ti 5 [27], locally noncentrosymmetric SrPtAs [28], and La 7 Ir 3 [29]. On the other hand, it found to be preserved in several other NCSs [12][13][14]16,[30][31][32].…”

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confidence: 96%

“…Indeed, unconventional superconductivity was found in several noncentrosymmetric superconductors. The examples are Li 2 (Pd,Pt) 3 B [8][9][10][11], Mo 3 Al 2 C [12], Re 3 W [13], Nb 0. 18 Re 0.82 [14,15], Y 2 C 3 [16], etc.…”

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Time-reversal symmetry breaking in the noncentrosymmetric superconductor Re6Ti

Singh

Barker

et al. 2018

Phys. Rev. B

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“…Re 24 Ti 5 [25], * rpsingh@iiserb.ac.in Nb 0. 18 Re 0.82 [26,27], and Re 6 Hf [28,29]. Most of these compounds exhibited single-band superconductivity except Nb 0.18 Re 0.82 , which showed double-gap superconductivity [27].…”

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confidence: 99%

Superconducting properties of the noncentrosymmetric superconductor TaOs

Singh

Sajilesh

Marik

et al. 2017

Supercond. Sci. Technol.

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The noncentrosymmetric superconductor TaOs has been characterized using x-ray diffraction, resistivity, magnetization, and specific heat measurements. Magnetization and specific heat measurements show a bulk superconducting transition at 2.07 K. These measurements suggest that TaOs is a weakly coupled type-II superconductor. The electronic specific heat in the superconducting state can be explained by the single-gap BCS model, suggesting s-wave superconductivity in TaOs.

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Structure and superconductivity of two different phases of Re3W

Cited by 50 publications

References 25 publications

Low superfluid density and possible multigap superconductivity in theBiS2-based layered superconductorBi4O4S3

Low superfluid density and possible multigap superconductivity in theBiS2-based layered superconductorBi4O4S3

Time-reversal symmetry breaking in the noncentrosymmetric superconductor Re6Ti

Superconducting properties of the noncentrosymmetric superconductor TaOs

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