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• W3100805775 abstract "We report the hydrostatic pressure effect on the charge density wave (CDW) and superconductivity (SC) of single-crystal $2Htext{ensuremath{-}}mathrm{Ta}{mathrm{Se}}_{2text{ensuremath{-}}x}{mathrm{S}}_{x}$ by measuring the electrical resistivity and ac magnetic susceptibility under various pressures up to 12.5 GPa. Different from the previously reported phase diagrams of CDW and SC as a function of the Se/S substitution and/or the uniaxial pressure, the superconducting transition temperature (${T}_{mathrm{c}}$) was found to increase monotonously with increasing the pressure at first and then reaches a maximum constant above a critical pressure ${P}_{mathrm{c}}$. The maximal ${{T}_{mathrm{c}}}^{mathrm{max}}$ is nearly two times higher than the optimal ones via the S doping and decreases with further increasing the S-doping level. High-pressure ac magnetic susceptibility demonstrates that the superconducting volume quickly increases along with the gradual suppression of CDW and reaches nearly 1 above ${P}_{mathrm{c}}$, which provides clear evidences for pressure-induced crossover from CDW to bulk SC. High-pressure x-ray diffraction proves that there is no structural phase transition in $2Htext{ensuremath{-}}mathrm{Ta}{mathrm{Se}}_{2}$ up to 20 GPa; although the dependence of ${T}_{mathrm{c}}$ on the volume shows distinct behaviors at the initial S doping and the applied physical pressure, they both collapse into a universal curve upon the further volume shrinkage. This indicates that both physical pressure and the S-doping-induced chemical pressure can melt CDW and enhance SC through lattice contraction consistently. In comparison with the effects of hydrostatic pressure, the S doping can destruct the CDW ground state faster due to the presence of chemical disorders, which also restrict the further enhancement of ${T}_{mathrm{c}}$ after the collapse of CDW." @default.
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• W3100805775 date "2020-11-18" @default.
• W3100805775 modified "2023-10-17" @default.
• W3100805775 title "Superconducting phase diagrams of S-doped <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mn>2</mml:mn><mml:mi>H</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Ta</mml:mi><mml:msub><mml:mi mathvariant=normal>Se</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> under hydrostatic pressure" @default.
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• W3100805775 doi "https://doi.org/10.1103/physrevb.102.184511" @default.
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