Superconductivity in Lithium Intercalated 1T– and 4Hb–TaS<sub>2</sub>

Nozuyama, Y.; Iida, Shūichi

doi:10.1143/jjap.23.l319

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…Figure a shows the structure of 1 T ‐TaS 2 with Star of David tantalum clustering which exists in the commensurate CDW (CCDW) and NCCDW phases . The selective growth of 1 T ‐TaS 2 was achieved at a high deposition temperature (850 °C) to avoid formation of the 2 H phase . The TaS 2 thickness was controlled by fine tuning the deposition temperature, deposition time, and precursor concentrations (see the Experimental Section).…”

Section: Comparison Of Experimental Responsivity Of Different Room Tementioning

confidence: 99%

Chemical Growth of 1T‐TaS₂ Monolayer and Thin Films: Robust Charge Density Wave Transitions and High Bolometric Responsivity

Wang

Liu

et al. 2018

Advanced Materials

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Ultrathin two-dimensional (2D) charge density wave (CDW) materials, with sharp resistance change at the phase-transition temperature, yet with ultrathin thickness, hold great potential for electrical device applications. However, chemical synthesis of high-quality samples and observation of the CDW states down to the monolayer limit is still of great challenge. Chemical vapor deposition of 1T-TaS sheets on hexagonal boron nitride (h-BN) with robust CDW states even down to the monolayer extreme is reported here. Further, based on the near commensurate CDW to incommensurate CDW phase transition with a high temperature coefficient of resistance (TCR), highly responsive room-temperature bolometers are fabricated by suspending the as-grown 1T-TaS sheets.

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Section: Comparison Of Experimental Responsivity Of Different Room Tementioning

confidence: 99%

Chemical Growth of 1T‐TaS₂ Monolayer and Thin Films: Robust Charge Density Wave Transitions and High Bolometric Responsivity

Wang

Liu

et al. 2018

Advanced Materials

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“…A large number of layered superconductors were made by doping (or intercalating) 2H-MoS 2 , 2H-TaS 2 , 1T -TaS 2 , 4H(b)-TaS 2 , 2H-ZrS 2 , and 2H-ZrSe 2 with alkali [125][126][127][128][129][130][131][132]. The resulting intercalation compounds were very air-sensitive and rather 3D in their properties.…”

Section: Intercalated Transition Metal Dichalcogenidesmentioning

confidence: 99%

Pristine and intercalated transition metal dichalcogenide superconductors

Klemm

2015

Physica C: Superconductivity and its Applications

116

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Transition metal dichalcogenides (TMDs) are quasi-two-dimensional layered compounds that exhibit strongly competing effects of charge-density wave (CDW) formation and superconductivity (SC). The weak van der Waals interlayer bonding between hexagonal layers of octahedral or trigonal prismatic TMD building blocks allows many polytypes to form. In the single layer 1T polytype materials, one or more CDW states can form, but the pristine TMDs are not superconducting. The 2H polytypes have two or more Fermi surfaces and saddle bands, allowing for dual orderings, which can be coexisting CDW and SC orderings, two SC gaps as in MgB2, two CDW gaps, and possibly even pseudogaps above the onset TCDWs of CDW orderings. Higher order polytypes allow for multiple CDW gaps and at least one superconducting gap. The CDW transitions TCDWs usually greatly exceed the superconducting transitions at their low Tc values, their orbital order parameters (OPs) are generally highly anisotropic and can even contain nodes, and the SC OPs can be greatly affected by their simultaneous presence. The properties of the CDWs ubiquitously seen in TMDs are remarkably similar to those of the pseudogaps seen in the high-Tc cuprates. In 2H-NbSe2, for example, the CDW renders its general s-wave SC OP orbital symmetry to be highly anisotropic and strongly reduces its Josephson coupling strength (IcRn) with the conventional SC, Pb. Hence, the pristine TMDs are highly "unconventional" in comparison with Pb, but are much more "conventional" than are the ferromagnetic superconductors such as URhGe. Applied pressure and intercalation generally suppress the TMD CDWs, allowing for enhanced SC formation, even in the 1T polytype materials. The misfit intercalation compound (LaSe)1.14(NbSe2) and many 2H-TMDs intercalated with organic Lewis base molecules, such as TaS2(pyridine) 1/2 , have completely incoherent c-axis transport, dimensional-crossover effects, and behave as stacks of intrinsic Josephson junctions. Except for the anomalously large apparent violation of the Pauli limit of the upper critical field of (LaSe)1.14(NbSe2), these normal state and superconducting properties of these intercalation compounds are very similar to those seen in the high-Tc superconductor, Bi2Sr2CaCu2O 8+δ and in the organic layered superconductor, κ-(ET)2Cu[N(CN)2]Br, where ET is bis(ethylenedithio)tetrathiafulvalene. Electrolytic intercalation of TMDs with water and metallic ions leads to compounds with very similar properties to cobaltates such as NaxCoO2 · yH2O.

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“…The 2H-TaS 2 (pyridine) 1/2 , as the first organic intercalation compound, shows an enhanced T c up to 3.5 K [23]. To further increase T c , various alkali-metal or transition-metal atoms have been introduced into the structure to modify the electronic states of 2H-TaS 2 by doping or intercalation [24][25][26][27]. The superconducting transition temperature in 2H-Cu x TaS 2 , for example, is found to increase with copper intercalation [26], while the CDW is gradually weakened until it disappears at the maximum value of T c , which is a very common feature of some intercalated TaS 2 or other two-dimensional materials.…”

Section: Introductionmentioning

confidence: 99%

“…The CDW state is weakened which has been proven by the anisotropy of resistivity and spectroscopic signatures on sodium intercalation [11,25]. Besides, there are reports of lithium intercalated TaS2 by solid-phase reaction or using n-butyllithium solution soaking strategies [21]. The corresponding Tc can reach up to 4.5 K, where the CDW state fully disappears.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity and charge density wave formation in lithium-intercalated 2H−TaS2

Liu

Huangfu²,

Zhang³

et al. 2021

Phys. Rev. B

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Superconductivity in Lithium Intercalated 1T– and 4Hb–TaS₂

Cited by 7 publications

References 4 publications

Chemical Growth of 1T‐TaS₂ Monolayer and Thin Films: Robust Charge Density Wave Transitions and High Bolometric Responsivity

Chemical Growth of 1T‐TaS₂ Monolayer and Thin Films: Robust Charge Density Wave Transitions and High Bolometric Responsivity

Pristine and intercalated transition metal dichalcogenide superconductors

Superconductivity and charge density wave formation in lithium-intercalated 2H−TaS2

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Superconductivity in Lithium Intercalated 1T– and 4Hb–TaS2

Cited by 7 publications

References 4 publications

Chemical Growth of 1T‐TaS2 Monolayer and Thin Films: Robust Charge Density Wave Transitions and High Bolometric Responsivity

Chemical Growth of 1T‐TaS2 Monolayer and Thin Films: Robust Charge Density Wave Transitions and High Bolometric Responsivity

Pristine and intercalated transition metal dichalcogenide superconductors

Superconductivity and charge density wave formation in lithium-intercalated 2H−TaS2

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Superconductivity in Lithium Intercalated 1T– and 4Hb–TaS₂

Chemical Growth of 1T‐TaS₂ Monolayer and Thin Films: Robust Charge Density Wave Transitions and High Bolometric Responsivity

Chemical Growth of 1T‐TaS₂ Monolayer and Thin Films: Robust Charge Density Wave Transitions and High Bolometric Responsivity