2D superconductivity and vortex dynamics in 1T-MoS2

Sharma, Chithra H.; Surendran, Ananthu P.; Varma, Sangeeth S.; Thalakulam, Madhu

doi:10.1038/s42005-018-0091-7

Cited by 31 publications

(29 citation statements)

References 70 publications

(100 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Fig. 4c, a linear relationship of U(H) ∝ −lnH is observed, in accordance with the model of thermally assisted collective flux motion in two dimensions, as recently observed in other 2D crystalline superconductors [5][6][7][8] . Figure 4d shows a lnρ 0 -lnH plot extracted from the Arrhenius plot of resistivity with H // c-axis, and illustrates the obtained result that ρ 0 is proportional to H −p with p ≈ 12.7, consistent with the calculation of p = U 0 /k B T m derived from the Anderson-Kim resistivity theory (for details, see Supplementary Note 2).…”

Section: Resultssupporting

confidence: 90%

“…The derived H c2 (T) values were used to plot the H c2,ab /H c2,c ratio versus reduced temperature T/T c , as seen in Fig. 3d; it does show a diverging characteristic on approaching T c , characteristic for a 2D nature, as recently observed 5,8,20 . The 2D superconducting behavior is further confirmed by experiments with a tilted magnetic field.…”

Section: Resultsmentioning

confidence: 74%

“…The 2D superconductivity let us consider the emergence of the Bose-metal phase recently identified in 1T-MoS 2 and NbSe 2 (refs. 5,56 ). Returning to the Arrhenius plot of resistivity, as shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…uperconductivity in reduced dimensions has attracted great attention since it is not only of importance for exploring attractive quantum phenomena at a novel state but also for potential application for developing superconducting electronics 1,2 . Recently, several new two-dimensional (2D) ultrathin superconducting systems have been realized in different materials and hetero-interfaces [3][4][5][6][7][8][9] . Typical transition metal oxide interfaces and interface superconductivity between chalcogenides reported so far include LaAlO 3 /SrTiO 3 (ref.…”

mentioning

confidence: 99%

“…In addition, 2D superconductivity has been particularly observed in some micrometer-size flakes with a fewlayer thickness, such as exfoliated 1T-MoS 2 (ref. 5 ), NbSe 2 (ref. 6 ), and ZrNCl single crystals 7 , or chemical-vapor-depositionsynthesized Mo 2 C 8 and 1T d -MoTe 2 thin films 9 .…”

mentioning

confidence: 99%

See 4 more Smart Citations

Two-dimensional superconductivity and magnetotransport from topological surface states in AuSn4 semimetal

et al. 2020

View full text Add to dashboard Cite

Topological materials such as Dirac or Weyl semimetals are new states of matter characterized by symmetry-protected surface states responsible for exotic low-temperature magnetotransport properties. Here, transport measurements on AuSn 4 single crystals, a topological nodal-line semimetal candidate, reveal the presence of two-dimensional superconductivity with a transition temperature T c~2 .40 K. The two-dimensional nature of superconductivity is verified by a Berezinsky-Kosterlitz-Thouless transition, Bose-metal phase, and vortex dynamics interpreted in terms of thermally-assisted flux motion in two dimensions. The normal-state magnetoconductivity at low temperatures is found to be well described by the weak-antilocalization transport formula, which has been commonly observed in topological materials, strongly supporting the scenario that normal-state magnetotransport in AuSn 4 is dominated by the surface electrons of topological Dirac-cone states. The entire results are summarized in a phase diagram in the temperature-magnetic field plane, which displays different regimes of transport. The combination of twodimensional superconductivity and surface-driven magnetotransport suggests the topological nature of superconductivity in AuSn 4 .

show abstract

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Two-dimensional superconductivity and magnetotransport from topological surface states in AuSn4 semimetal

et al. 2020

View full text Add to dashboard Cite

show abstract

High Phase Purity of Large‐Sized 1T′‐MoS₂ Monolayers with 2D Superconductivity

et al. 2019

View full text Add to dashboard Cite

The development of transition metal dichalcogenides has greatly accelerated research in the 2D realm, especially for layered MoS2. Crucially, the metallic MoS2 monolayer is an ideal platform in which novel topological electronic states can emerge and also exhibits excellent energy conversion and storage properties. However, as its intrinsic metallic phase, little is known about the nature of 2D 1T′‐MoS2, probably because of limited phase uniformity (<80%) and lateral size (usually <1 µm) in produced materials. Herein, solution processing to realize high phase‐purity 1T′‐MoS2 monolayers with large lateral size is demonstrated. Direct chemical exfoliation of millimeter‐sized 1T′ crystal is introduced to successfully produce a high‐yield of 1T′‐MoS2 monolayers with over 97% phase purity and unprecedentedly large size up to tens of micrometers. Furthermore, the large‐sized and high‐quality 1T′‐MoS2 nanosheets exhibit clear intrinsic superconductivity among all thicknesses down to monolayer, accompanied by a slow drop of transition temperature from 6.1 to 3.0 K. Prominently, unconventional superconducting behavior with upper critical field far beyond the Pauli limit is observed in the centrosymmetric 1T′‐MoS2 structure. The results open up an ideal approach to explore the properties of 2D metastable polymorphic materials.

show abstract

Quasi‐Binary Transition Metal Dichalcogenide Alloys: Thermodynamic Stability Prediction, Scalable Synthesis, and Application

et al. 2020

View full text Add to dashboard Cite

Transition metal dichalcogenide (TMDCs) alloys could provide a wide range of physical and chemical properties, ranging from charge density waves to superconductivity and electrochemical activities. While many exciting behaviors of unary TMDCs have been predicted, the vast compositional space of TMDC alloys has remained largely unexplored due to our lack in understanding of their stability when accommodating different cations or chalcogens in a single-phase. Here, we report a theory-guided synthesis approach to achieve unexplored quasi-binary TMDC alloys through computationally predicted stability maps. We have generated equilibrium temperature-composition phase diagrams using first-principles calculations to identify the stability for 25 quasi-binary TMDC alloys, including those involving non-isovalent cations and verify them experimentally by synthesizing a subset of 12 predicted alloys using a scalable chemical vapor transport method. We demonstrate that the synthesized alloys can be exfoliated into 2D structures, and some of them exhibit: (i) outstanding thermal stability tested up to 1230 K, (ii) exceptionally high electrochemical activity for CO 2 reduction reaction in a kinetically limited regime with near zero overpotential for CO formation, (iii) excellent energy efficiency in a high rate Li-air battery, and (iv) high break-down current density for interconnect applications. This framework can be extended to accelerate the discovery of other TMDC alloys for various applications.As a class of 2D materials, transition metal dichalcogenides (TMDCs) display diverse physical properties, including topological insulator properties, [1,2] superconductivity, [3][4][5][6] valley polarization, [7][8][9][10] and enhanced electrocatalytic activity for various chemical reactions. [11][12][13][14][15][16][17][18] This diversity arises due to the ability of TMDCs to accommodate different transition-metal elements, such as Mo, W, V, Nb, Ta, Re and others, with the three chalcogens (S, Se, and Te) in stable layered structures -that can be exfoliated to a desired number of 2D layers to control quantum confinement. Their properties can be further tuned

show abstract

2D superconductivity and vortex dynamics in 1T-MoS2

Cited by 31 publications

References 70 publications

Two-dimensional superconductivity and magnetotransport from topological surface states in AuSn4 semimetal

Two-dimensional superconductivity and magnetotransport from topological surface states in AuSn4 semimetal

High Phase Purity of Large‐Sized 1T′‐MoS₂ Monolayers with 2D Superconductivity

Quasi‐Binary Transition Metal Dichalcogenide Alloys: Thermodynamic Stability Prediction, Scalable Synthesis, and Application

Contact Info

Product

Resources

About

2D superconductivity and vortex dynamics in 1T-MoS2

Cited by 31 publications

References 70 publications

Two-dimensional superconductivity and magnetotransport from topological surface states in AuSn4 semimetal

Two-dimensional superconductivity and magnetotransport from topological surface states in AuSn4 semimetal

High Phase Purity of Large‐Sized 1T′‐MoS2 Monolayers with 2D Superconductivity

Quasi‐Binary Transition Metal Dichalcogenide Alloys: Thermodynamic Stability Prediction, Scalable Synthesis, and Application

Contact Info

Product

Resources

About

High Phase Purity of Large‐Sized 1T′‐MoS₂ Monolayers with 2D Superconductivity