Absence of superconducting dome at the charge-density-wave quantum phase transition in 2H-NbSe2

Abstract

Superconductivity is often found in a dome around quantum critical points, i.e. 2nd-order quantum phase transitions. Here, we show that an enhancement of superconductivity is avoided at the critical pressure of the charge-density-wave (CDW) state in NbSe${}_2$. We present comprehensive high-pressure Hall effect and magnetic susceptibility measurements of the CDW and superconducting state in NbSe${}_2$. Initially, the 2nd-order CDW transition is suppressed smoothly but it drops to zero abruptly at PCDW = 4.4 GPa thus indicating a change to 1st order whilstthe superconducting transition temperature Tc rises continuously up to PCDW but is constant above. The putative 1st-order nature of the CDW transition is suggested as the cause for the absence of a superconducting dome at PCDW. Indeed, we show that the suppression of the superconducting state at low pressures is due to the loss of density of states inside the CDW phase whilst the initial suppression of the CDW state is accounted for by the stiffening of the underlying bare phonon mode.

arXiv comment16 pages, 5 figures, SI

References in corpus (24)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Superconductivity in Cu_xTiSe_2
• Extended Phonon Collapse and the Origin of the Charge-Density-Wave in NbSe${}_2$
• Metallic Quantum Ferromagnets
• Hybrid superconducting-magnetic memory device using competing order parameters
• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Lifshitz critical point in the cuprate superconductor YBa2Cu3Oy from high-field Hall effect measurements
• Quasiparticle mass enhancement approaching optimal doping in a high-Tc superconductor
• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2
• Pressure-induced and Composition-induced Structural Quantum Phase Transition in the Cubic Superconductor (Sr/Ca)_3Ir_4Sn_{13}
• Pressure induced effects on the Fermi surface of superconducting 2H-NbSe${}_2$
• Penetration depth study of superconducting gap structure of 2\textit{H}-NbSe${}_2$
• Strong anharmonicity induces quantum melting of charge density wave in 2H-NbSe$\_2$ under pressure
• Upper critical field in dirty two-band superconductors: breakdown of the anisotropic Ginzburg-Landau theory
• Using controlled disorder to probe the interplay between charge order and superconductivity in NbSe2
• Charge Order from Orbital-dependent Coupling Evidenced by NbSe${}_2$
• Order parameter fluctuations at a buried quantum critical point
• Charge ordering in superconducting copper oxides
• Quantum Tricritical Points in NbFe${}_2$
• Fermi surface reconstruction and electron dynamics at the charge-density-wave transition in TiSe2
• Charge Order in NbSe${}_2$
• Tilted vortex cores and superconducting gap anisotropy in 2H-NbSe2
• Ab initio calculations of H${}_{c2}$ for Nb, NbSe2, and MgB2

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• Double superconducting dome and triple enhancement of Tc in the kagome superconductor CsV3Sb5 under high pressure
• Lifshitz transition enabling superconducting dome around the quantum critical point in TiSe${}_2$
• Effects of 3 MeV Proton Irradiation on Superconductivity and CDW in 2H-NbSe2 Single Crystals
• Charge-density-wave quantum critical point under pressure in 2$H$-TaSe${}_2$
• Pressure-induced reconstructive phase transition in Cd${}_3$As${}_2$
• Peak Effects Induced by Particle Irradiations in 2H-NbSe2
• Pressure-Induced Enhancement of Superfluid Density in Transition Metal Dichalcogenides with and without Charge Density Wave
• Machine learning model for efficient nonthermal tuning of the charge density wave in monolayer NbSe${}_2$
• Magnetic Frustration Enforced Electronic Reconstruction in Ni intercalated NbSe${}_2$: Suppression of Electronic Orders