Upper and Lower Critical Fields of TaS<sub>2</sub>(Pyridine)<sub>1/2</sub>

Kashihara, Yasuharu; Nishida, Akihiko; Yoshioka, Hide

doi:10.1143/jpsj.46.1112

Cited by 19 publications

(13 citation statements)

References 11 publications

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“…The pure 24.04 A phase has been obtained by addition of sulfur to the dry pyridine used in the reaction (31), and the results are reproducible (36). The 24.04 A compound has been observed to convert to a mixture of the two phases on standing in air for several weeks (37).…”

Section: Synthesismentioning

confidence: 86%

Organic and Organometallic Intercalation Compounds of the Transition Metal Dichalcogenides

Jacobson¹

1982

Intercalation Chemistry

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Section: Synthesismentioning

confidence: 86%

Organic and Organometallic Intercalation Compounds of the Transition Metal Dichalcogenides

Jacobson¹

1982

Intercalation Chemistry

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“…Close to T c , the dependence of H ⊥ c2 is fitted well by the phenomenological 2D Ginzburg-Landau (GL) model, which yields ξ(0) = 19, 20, 26 nm for 2, 3, 5-layer respectively, where ξ(0) denotes the GL coherence length at zero temperature. The reported values 27,28 for 3D ranges from 22 nm to 32.6 nm. For in-plane field, we observe a much larger H c2 = 32 T at 300 mK for a bilayer (T c = 2.8 K), which is more than six times the Pauli paramagnetic limit H p , obeying a square root rather than a linear temperature dependence (inset of Fig.…”

Section: B Enhanced Superconductivity In the Monolayer Limitmentioning

confidence: 99%

Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS2 in the two-dimensional limit

et al. 2018

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Layered transition metal dichalcogenides that host coexisting charge-density wave (CDW) and superconducting orders provide ideal systems for exploring the effects of dimensionality on correlated electronic phases. Dimensionality has a profound effect on both superconductivity and CDW instabilities. Here we report a substantial enhancement of the superconducting Tc to 3.4 K for 2H-TaS2 in the monolayer limit, compared to 0.8 K in the bulk. In addition, the transport signature of a CDW phase transition vanishes in the 2D limit. In our analysis of electronic and vibrational properties of this material, we show that a reduction of the CDW amplitude results in a substantial increase of the density of states at the Fermi energy, which can boost Tc by an amount similar to that seen in experiment. Our results indicate competition between CDW order and superconductivity in ultra-thin 2H-TaS2 down to the monolayer limit, providing insight towards understanding correlated electronic phases in reduced dimensions.

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“…Studies of the transition temperatures for exfoliated crystals of 2H-TaS2 showed that there is a pronounced enhancement in Tc from 0.5 to 2.2 K as the crystals are thinned down from thickness of 2b = 14.9 nm to 2b = 3.5 nm [17]. A literature search for the Ginsburg-Landau parameter  for 2H-TaS2 reveals a quite large scatter, i.e.,  = 9.5 [50] [53], with an average value of  = 10.7 ± 3.9. From this mean value we can estimate a range of expected (0), based on the measured value of Bc2(0) = 0.11 T [17], which converts by Eq.…”

Section: Exfoliated 2h-tas2mentioning

confidence: 99%

On the origin of critical temperature enhancement in atomically thin superconductors

et al. 2017

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Recent experiments showed that thinning gallium, iron selenide and 2H tantalum disulfide to single/several monoatomic layer(s) enhances their superconducting critical temperatures.Here, we characterize these superconductors by extracting the absolute values of the London penetration depth, the superconducting energy gap, and the relative jump in specific heat at the transition temperature from their self-field critical currents. Our central finding is that the enhancement in transition temperature for these materials arises from the opening of an additional superconducting gap, while retaining a largely unchanged "bulk" superconducting gap. Literature data reveals that ultrathin niobium films similarly develop a second 2 superconducting gap. Based on the available data, it seems that, for type-II superconductors, a new superconducting band appears when the film thickness becomes smaller than the out-ofplane coherence length. The same mechanism may also be the cause of enhanced interface superconductivity.

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Upper and Lower Critical Fields of TaS₂(Pyridine)_1/2

Cited by 19 publications

References 11 publications

Organic and Organometallic Intercalation Compounds of the Transition Metal Dichalcogenides

Organic and Organometallic Intercalation Compounds of the Transition Metal Dichalcogenides

Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS2 in the two-dimensional limit

On the origin of critical temperature enhancement in atomically thin superconductors

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Upper and Lower Critical Fields of TaS2(Pyridine)1/2

Cited by 19 publications

References 11 publications

Organic and Organometallic Intercalation Compounds of the Transition Metal Dichalcogenides

Organic and Organometallic Intercalation Compounds of the Transition Metal Dichalcogenides

Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS2 in the two-dimensional limit

On the origin of critical temperature enhancement in atomically thin superconductors

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Upper and Lower Critical Fields of TaS₂(Pyridine)_1/2