Enhanced critical field and anomalous metallic state in two-dimensional centrosymmetric 
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Ji, Yiru; Chu, Yanbang; Zhi, Aomiao; Tian, Jinpeng; Tang, Jian; Liu, Le; Wu, Fa-Quan; Yuan, Yalong; Yang, Rong; Tian, Xuezeng; Shi, Dean; Bai, Xuedong; Yang, Wei; Zhang, Guangyu

doi:10.1103/physrevb.105.l161402

Cited by 7 publications

(4 citation statements)

References 50 publications

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“…This results in an out-of-plane upper critical magnetic field

0

of 5.3 T and an in-plane GL superconducting coherence length of ξ GL (0) ∼7.9 nm. Fitting the in-plane H c 2 versus T c yields an in-plane upper critical magnetic field

0

of 30.1 T. Similar to the recently reported mechanically exfoliated few-layer 1T′-WS 2 ( 46 ) and printed NbSe 2 film ( 6 ), the

0

of the printed 1T′-WS 2 film is very high, far beyond its Bardeen-Schrieffer-Cooper Pauli paramagnetic limit of 13.1 T ( H p ∼1.84 T c ) ( 47 ). However, the symmetry of the centrosymmetric 1T′ structure of WS 2 is fundamentally different from the noncentrosymmetric hexagonal structure of NbSe 2 , where Ising-type superconductivity is responsible for exceeding the Pauli limit ( 6 , 45 ).…”

Section: Resultssupporting

confidence: 83%

Synthesis of an aqueous, air-stable, superconducting 1T′-WS ₂ monolayer ink

Song

Singha

Cheng³

et al. 2023

Sci. Adv.

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Liquid-phase chemical exfoliation can achieve industry-scale production of two-dimensional (2D) materials for a wide range of applications. However, many 2D materials with potential applications in quantum technologies often fail to leave the laboratory setting because of their air sensitivity and depreciation of physical performance after chemical processing. We report a simple chemical exfoliation method to create a stable, aqueous, surfactant-free, superconducting ink containing phase-pure 1T′-WS 2 monolayers that are isostructural to the air-sensitive topological insulator 1T′-WTe 2 . The printed film is metallic at room temperature and superconducting below 7.3 kelvin, shows strong anisotropic unconventional superconducting behavior with an in-plane and out-of-plane upper critical magnetic field of 30.1 and 5.3 tesla, and is stable at ambient conditions for at least 30 days. Our results show that chemical processing can make nontrivial 2D materials that were formerly only studied in laboratories commercially accessible.

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“…This results in an out-of-plane upper critical magnetic field

0

of 5.3 T and an in-plane GL superconducting coherence length of ξ GL (0) ∼7.9 nm. Fitting the in-plane H c 2 versus T c yields an in-plane upper critical magnetic field

0

of 30.1 T. Similar to the recently reported mechanically exfoliated few-layer 1T′-WS 2 ( 46 ) and printed NbSe 2 film ( 6 ), the

0

Section: Resultssupporting

confidence: 83%

Synthesis of an aqueous, air-stable, superconducting 1T′-WS ₂ monolayer ink

Song

Singha

Cheng³

et al. 2023

Sci. Adv.

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“…Here, C is a dimensionless constant, R n is the sheet resistance of the normal state, and H c2 is the perpendicular upper critical field. Besides ZrNCl, experimental signatures of the anomalous metal states have also been reported in other crystalline nanodevices made of exfoliated 2D materials, such as WTe 2 [149], TiSe 2 [150], MoS 2 [151], TaSe 2 [152], Li x TiSe 2 [153], and WS 2 [154] (see table 4 for a list of representative anomalous metal states and the tuning methods).…”

Section: Experimental Signatures In Strongly Disordered 2d Supercondu...mentioning

confidence: 77%

“…The developments of film growth and nanofabrication technique in recent decades have made new opportunity to study the quantum phase transitions and the anomalous metal states in crystalline superconducting films and nanodevices. In this section, we focus on recent progress on the signatures of anomalous metal states observed in 2D crystalline superconductors [32,38,[149][150][151][152][153][154][155][156][157][158][159][160][161][162].…”

Section: Experimental Signatures In Strongly Disordered 2d Supercondu...mentioning

confidence: 99%

Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress

Wang,

Liu,

et al. 2023

Rep. Prog. Phys.

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Superconductor–insulator/metal transition (SMT) as a paradigm of quantum phase transition has been a research highlight over the last three decades. Benefit from recent developments in the fabrication and measurements of two-dimensional (2D) superconducting films and nanodevices, unprecedented quantum phenomena have been revealed in the quantum phase transitions of 2D superconductors. In this review, we introduce the recent progress on quantum phase transitions in 2D superconductors, focusing on the quantum Griffiths singularity (QGS) and anomalous metal state. Characterized by a divergent critical exponent when approaching zero temperature, QGS of SMT is discovered in ultrathin crystalline Ga films and subsequently detected in various 2D superconductors. The universality of QGS indicates the profound influence of quenched disorder on quantum phase transitions. Besides, in a 2D superconducting system, whether a metallic ground state can exist is a long-sought mystery. Early experimental studies indicate an intermediate metallic state in the quantum phase transition of 2D superconductors. Recently, in high-temperature superconducting films with patterned nanopores, a robust anomalous metal state (i.e. quantum metal or Bose metal) has been detected, featured as the saturated resistance in the low temperature regime. Moreover, the charge-2e quantum oscillations are observed in nanopatterned films, indicating the bosonic nature of the anomalous metal state and ending the debate on whether bosons can exist as a metal. The evidences of the anomalous metal states have also been reported in crystalline epitaxial thin films and exfoliated nanoflakes, as well as granular composite films. High quality filters are used in these works to exclude the influence of external high frequency noises in ultralow temperature measurements. The observations of QGS and metallic ground states in 2D superconductors not only reveal the prominent role of quantum fluctuations and dissipations but also provide new perspective to explore quantum phase transitions in superconducting systems.

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“…However, this method usually generates low yields of the desired products. Because the physicochemical quality of exfoliated TMD nanosheets remains the same as that of the bulk, mechanical exfoliation is an ideal platform for studying properties in the extremely thin regime or transferring films to substrates for further fabricating devices. , However, during the monolayer transfer, the exposure to ambient air and removal of the adhesive tape in solution probably stain the basal plane of the exfoliated ultrathin TMD nanosheet via small molecules or organic residues, which would induce the degradation of properties by shifting the Raman frequency and weakening the PL emission . This issue is well addressed using dry transfer via PDMS stamping and thermal-release tape instead of conventional Scotch tape. , Dry transfer exploits the strong interaction between the TMD monolayer and substrate, such as MoS 2 and gold.…”

Section: Direct Synthesis Of Ultrathin 1t/1t′ Tmd Nanosheetsmentioning

confidence: 99%

Recent Strategies for the Synthesis of Phase-Pure Ultrathin 1T/1T′ Transition Metal Dichalcogenide Nanosheets

Dai,

Su,

Guo

et al. 2023

Chem. Rev.

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The past few decades have witnessed a notable increase in transition metal dichalcogenide (TMD) related research not only because of the large family of TMD candidates but also because of the various polytypes that arise from the monolayer configuration and layer stacking order. The peculiar physicochemical properties of TMD nanosheets enable an enormous range of applications from fundamental science to industrial technologies based on the preparation of high-quality TMDs. For polymorphic TMDs, the 1T/1T′ phase is particularly intriguing because of the enriched density of states, and thus facilitates fruitful chemistry. Herein, we comprehensively discuss the most recent strategies for direct synthesis of phase-pure 1T/1T′ TMD nanosheets such as mechanical exfoliation, chemical vapor deposition, wet chemical synthesis, atomic layer deposition, and more. We also review frequently adopted methods for phase engineering in TMD nanosheets ranging from chemical doping and alloying, to charge injection, and irradiation with optical or charged particle beams. Prior to the synthesis methods, we discuss the configuration of TMDs as well as the characterization tools mostly used in experiments. Finally, we discuss the current challenges and opportunities as well as emphasize the promising fields for the future development.

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Enhanced critical field and anomalous metallic state in two-dimensional centrosymmetric 1T′−WS2

Cited by 7 publications

References 50 publications

Synthesis of an aqueous, air-stable, superconducting 1T′-WS ₂ monolayer ink

Synthesis of an aqueous, air-stable, superconducting 1T′-WS ₂ monolayer ink

Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress

Recent Strategies for the Synthesis of Phase-Pure Ultrathin 1T/1T′ Transition Metal Dichalcogenide Nanosheets

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Enhanced critical field and anomalous metallic state in two-dimensional centrosymmetric 1T′−WS2

Cited by 7 publications

References 50 publications

Synthesis of an aqueous, air-stable, superconducting 1T′-WS 2 monolayer ink

Synthesis of an aqueous, air-stable, superconducting 1T′-WS 2 monolayer ink

Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress

Recent Strategies for the Synthesis of Phase-Pure Ultrathin 1T/1T′ Transition Metal Dichalcogenide Nanosheets

Contact Info

Product

Resources

About

Synthesis of an aqueous, air-stable, superconducting 1T′-WS ₂ monolayer ink

Synthesis of an aqueous, air-stable, superconducting 1T′-WS ₂ monolayer ink