Abstract
The unique electronic structure and crystal structure driven by external pressure in transition metal tellurides (TMTs) can host unconventional quantum states. Here, the discovery of pressure‐induced phase transition at ≈2 GPa, and dome‐shaped superconducting phase emerged in van der Waals layered NbIrTe4 is reported. The highest critical temperature (T c) is ≈5.8 K at pressure of ≈16 GPa, where the interlayered Te–Te covalent bonds form simultaneously derived from the synchrotron diffraction data, indicating the hosting structure of superconducting evolved from low‐pressure two‐dimensional (2D) phase to three‐dimensional (3D) structure with pressure higher than 30 GPa. Strikingly, the authors have found an anisotropic transport in the vicinity of the superconducting state, suggesting the emergence of a “stripe”‐like phase. The dome‐shaped superconducting phase and anisotropic transport are possibly due to the spatial modulation of interlayer Josephson coupling .
Highlights
Two-dimensional (2D) or layered structures can hold rich quanmetal dichalcogenides (TMD) NbSe2 gives a much-reduced critical temperature (Tc) compared with its bulk crystal.[6]
The ambient NbIrTe4 hosts a similar character of large magneto-resistance (LMR) with WTe2 in which the nearly perfectly balanced electron–hole populations are responsible for the LMR effect,[24] as shown in Figure S1, Supporting Information. Such perfectly balanced electron–hole populations cannot coexist with superconductivity, as superconductivity was starting to be observed once LMR was totally suppressed by pressure[13] and it is proved that Fermi surfaces will undergo reconstruction under pressure with the ambient two pairs of electrons and hole Fermi surfaces transforming to a single growing pair of Fermi surfaces in WTe2.[25]To further reveal how the LMR state evolves into the superconducting state in NbIrTe4, we systematically investigated the magnetic dependence of electrical resistance with field perpendicular to electric current of abplane at different pressures as shown in Figure S4a–c, Supporting Information
The results indicated that the MR of NbIrTe4 is suppressed by the application of pressure and reaches a minimum at 2.1 GPa
Summary
Two-dimensional (2D) or layered structures can hold rich quanmetal dichalcogenides (TMD) NbSe2 gives a much-reduced critical temperature (Tc) compared with its bulk crystal.[6]. High pressure is an important tool to regulate physical properties of condensed matter by directly changing lattice parameters and anisotropy without introducing impurities, is still an effective reversible in situ approach to effectively tune interlayer coupling, electronic structure, order parameter, and dimensionality of TMD van der Waals layered structures. The enhanced coupling is called to be responsible for the global superconducting at ≈5 GPa, maximum Tc at ≈16 GPa; and pressure induced degree of disordering for the high pressure “stripe phase.” These anisotropic properties and their relationships with interlayer coupling provide a potential pathway of studying/identifying the minimized functional block holding various quantum states and, designing of 2D devices through the understanding of proximity effects, charge transfer, stresses, and even magnetic exchanges addressed by the bilateral nearest layers or substrates holding the 2D thin films The enhanced coupling is called to be responsible for the global superconducting at ≈5 GPa, maximum Tc at ≈16 GPa; and pressure induced degree of disordering for the high pressure “stripe phase.” These anisotropic properties and their relationships with interlayer coupling provide a potential pathway of studying/identifying the minimized functional block holding various quantum states and, designing of 2D devices through the understanding of proximity effects, charge transfer, stresses, and even magnetic exchanges addressed by the bilateral nearest layers or substrates holding the 2D thin films
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