Node-like excitations in superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi><mml:msub><mml:mi mathvariant="normal">Mo</mml:mi><mml:mn>6</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>probed by scanning tunneling spectroscopy

Dubois, Cédric; Petrović, Alexander Paul; Santi, Gilles; Berthod, Christophe; Manuel, Α. A.; Decroux, M.; Fischer, Ø.; Potel, M.; Chevrel, R.

doi:10.1103/physrevb.75.104501

Cited by 13 publications

(18 citation statements)

References 21 publications

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“…This may not be the case for CPs: Figure 2(c) displays a SnMo 6 S 8 spectrum from a terrace after 3 months of measurements comprising numerous thermal and magnetic cycles. It is qualitatively similar to data from [19] [see Fig. 2(f)], providing good evidence for low-energy states within the large gap, but does not display a distinct smaller gap.…”

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confidence: 83%

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Multiband Superconductivity in the Chevrel PhasesSnMo6S8andPbMo6S8

et al. 2011

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Sub-Kelvin scanning tunneling spectroscopy in the Chevrel phases SnMo6S8 and PbMo6S8 reveals two distinct superconducting gaps with Δ1=3 meV, Δ2∼1.0 meV and Δ1=3.1 meV, Δ2∼1.4 meV, respectively. The gap distribution is strongly anisotropic, with Δ2 predominantly seen when scanning across unit-cell steps on the (001) sample surface. The spectra are well fitted by an anisotropic two-band BCS s-wave gap function. Our spectroscopic data are confirmed by electronic heat capacity measurements, which also provide evidence for a twin-gap scenario.

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confidence: 83%

“…In Ref. [19], measurements were performed on old crystals at 1.9 K in an exchange gas, compared with freshly grown samples at 0.4-0.5 K and high vacuum in the present work. The increased thermal broadening at 1.9 K blurs the two gaps, though this should not be sufficient to render the smaller gap invisible.…”

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Multiband Superconductivity in the Chevrel PhasesSnMo6S8andPbMo6S8

et al. 2011

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“…The shape of the spectra near the Fermi energy is close to the V-shape with a smeared bottom and is reminiscent of that in Cuprates21 or Chevrel phase family of superconductor PdMo 6 S 8 (Ref. 22). Before this work, the measurements of thermal conductivity in Ta 4 Pd 3 Te 16 suggest that there may exist nodes in the gap functions18.…”

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confidence: 52%

Anisotropic Superconducting Gap and Elongated Vortices with Caroli-De Gennes-Matricon States in the New Superconductor Ta4Pd3Te16

Fang

Zhen-yu

et al. 2015

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The superconducting state is formed by the condensation of a large number of Cooper pairs. The normal state electronic properties can give significant influence on the superconducting state. For usual type-II superconductors, the vortices are cylinder like with a round cross-section. For many two dimensional superconductors, such as Cuprates, albeit the in-plane anisotropy, the vortices generally have a round shape. In this paper we report results based on the scanning tunnelling microscopy/spectroscopy measurements on a newly discovered superconductor Ta4Pd3Te16. The chain-like conducting channels of PdTe2 in Ta4Pd3Te16 make a significant anisotropy of the in-plane Fermi velocity. We suggest at least one anisotropic superconducting gap with gap minima or possible node exists in this multiband system. In addition, elongated vortices are observed with an anisotropy of ξ||b/ξ&bottom⊥b ≈ 2.5. Clear Caroli-de Gennes-Matricon states are also observed within the vortex cores. Our results will initiate the study on the elongated vortices and superconducting mechanism in the new superconductor Ta4Pd3Te16.

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“…The nature of the superconducting state in Tl 2 Mo 6 Se 6 and In 2 Mo 6 Se 6 also remains very unclear, particularly since recent scanning tunneling microscopy experiments 18,19 on the related quasi-3D Chevrel phase superconductor PbMo 6 S 8 have provided strong evidence for a highly anisotropic multiband gap function. Inelastic neutron-scattering measurements of the phonon density of states ͑PDoS͒ ͑Ref.…”

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Phonon mode spectroscopy, electron-phonon coupling, and the metal-insulator transition in quasi-one-dimensionalM2Mo6Se6

et al. 2010

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We present electronic-structure calculations, electrical resistivity data, and the first specific-heat measurements in the normal and superconducting states of quasi-one-dimensional M 2 Mo 6 Se 6 ͑M =Tl,In,Rb͒. Rb 2 Mo 6 Se 6 undergoes a metal-insulator transition at ϳ170 K: electronic-structure calculations indicate that this is likely to be driven by the formation of a dynamical charge-density wave. However, Tl 2 Mo 6 Se 6 and In 2 Mo 6 Se 6 remain metallic down to low temperature, with superconducting transitions at T c = 4.2 K and 2.85 K, respectively. The absence of any metal-insulator transition in these materials is due to a larger in-plane bandwidth, leading to increased interchain hopping which suppresses the density wave instability. Electronic heat-capacity data for the superconducting compounds reveal an exceptionally low density of states D E F = 0.055 states eV −1 atom −1 , with BCS fits showing 2⌬ / k B T c Ն 5 for Tl 2 Mo 6 Se 6 and 3.5 for In 2 Mo 6 Se 6 . Modeling the lattice specific heat with a set of Einstein modes, we obtain the approximate phonon density of states F͑͒. Deconvolving the resistivity for the two superconductors then yields their electron-phonon transport coupling function ␣ tr 2 F͑͒. In Tl 2 Mo 6 Se 6 and In 2 Mo 6 Se 6 , F͑͒ is dominated by an optical "guest ion" mode at ϳ5 meV and a set of acoustic modes from ϳ10 to 30 meV. Rb 2 Mo 6 Se 6 exhibits a similar spectrum; however, the optical phonon has a lower intensity and is shifted to ϳ8 meV. Electrons in Tl 2 Mo 6 Se 6 couple strongly to both sets of modes, whereas In 2 Mo 6 Se 6 only displays significant coupling in the 10-18 meV range. Although pairing is clearly not mediated by the guest ion phonon, we believe it has a beneficial effect on superconductivity in Tl 2 Mo 6 Se 6 , given its extraordinarily large coupling strength and higher T c compared to In 2 Mo 6 Se 6 .

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Node-like excitations in superconductingPbMo6S8probed by scanning tunneling spectroscopy

Cited by 13 publications

References 21 publications

Multiband Superconductivity in the Chevrel PhasesSnMo6S8andPbMo6S8

Multiband Superconductivity in the Chevrel PhasesSnMo6S8andPbMo6S8

Anisotropic Superconducting Gap and Elongated Vortices with Caroli-De Gennes-Matricon States in the New Superconductor Ta4Pd3Te16

Phonon mode spectroscopy, electron-phonon coupling, and the metal-insulator transition in quasi-one-dimensionalM2Mo6Se6

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