Superconductivity in Cu_xTiSe_2

Abstract

Charge density waves (CDWs) are periodic modulations of the conduction electron density in solids. They are collective states that arise from intrinsic instabilities often present in low dimensional electronic systems. The layered dichalcogenides are the most well-studied examples, with TiSe_2 one of the first CDW-bearing materials known. The competition between CDW and superconducting collective electronic states at low temperatures has long been held and explored, and yet no chemical system has been previously reported where finely controlled chemical tuning allows this competition to be studied in detail. Here we report how, upon controlled intercalation of TiSe_2 with Cu to yield Cu_xTiSe_2, the CDW transition is continuously suppressed, and a new superconducting state emerges near x = 0.04, with a maximum T_c of 4.15 K found at x = 0.08. Cu_xTiSe_2 thus provides the first opportunity to study the CDW to Superconductivity transition in detail through an easily-controllable chemical parameter, and will provide new insights into the behavior of correlated electron systems.

Accepted to Nature Physics

References in corpus (3)

• Fabrication and superconductivity of NaxTaS2 crystals
• Competition between Superconductivity and Charge Density Wave Ordering in the Lu${}_5$Ir${}_4$(Si${}_{1-x}$Ge${}_x$)${}_{10}$ Alloy System
• Pinning frequencies of the collective modes in $\alpha$-uranium

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• The maximal superconductivity in proximity to charge density wave quantum critical point in Cu${}_x$TiSe${}_2$
• Superconducting Sn-Intercalated TaSe${}_2$: Structural Diversity Obscured by Routine Characterization Techniques
• ${}^{77}$Se and ${}^{63}$Cu NMR studies of the electronic correlations in Cu${}_x$TiSe${}_2$ ($x=0.05,0.07$)
• Evidence of unconventional pairing in the quasi two-dimensional CuIr${}_2$Te${}_4$ superconductor
• A variational Monte Carlo study of exciton condensation
• Periodic surface modulation of $(LaSe{)}_{1.14}(NbS{e}_2)$ observed by scanning tunneling microscopy
• Superconductivity at 12 K in La${}_2$IOs${}_2$: a 5d metal with osmium honeycomb layer
• Pressure-induced enhancement of the superconducting transition temperature in La2O2Bi3AgS6
• Building bridges: matching density functional theory with experiment
• Observation of resistive switching and diode effect in the conductivity of TiTe2 point contacts
• Insensitivity of the striped charge-orders in IrTe${}_2$ to alkali surface doping implies their structural origin
• Impact of disorder in the charge-density-wave state of Pd-intercalated ErTe${}_3$ revealed by the electrodynamic response
• Possible Pressure-Induced Charge-Density Wave Quantum Critical Point in LuPd2In
• Sn${}_{0.06}$Cr${}_3$Te${}_4$: A Skyrmion Superconductor
• Superconductivity in CuIr2-xAlxTe4 telluride chalcogenides
• Elastic Soft Mode and Electric Quadrupole Response in Excitonic Insulator Candidate (Ta${}_{0.952}$V${}_{0.048}$)${}_2$NiSe${}_5$: Contribution of Electron-Phonon Interaction
• Density-wave like behavior in a new Kagome material Ce${}_2$Ru${}_3$Si
• Ferromagnetism in layered metallic Fe1/4TaS2 in the presence of conventional and Dirac carriers
• Doping-induced nematic and stripe orders within the charge density wave state of TiSe${}_2$
• Charge-Ordered States and the Phase Diagram of the Extended Hubbard Model on the Bethe lattice
• Introduction to High-Temperature Superconductivity for Solid State Chemists
• Incommensurate charge density wave on multiband intermetallic systems exhibiting competing orders
• Superconducting gap and its Little-Parks like oscillations with high-order harmonics in lithium intercalated 1T-TiSe${}_2$
• A room temperature polar ferromagnetic metal
• Effects of a Magnetic Field on Superconductivity and Quantum Criticality in Quasi-Two-Dimensional Systems with Dirac Electrons
• The analysis on the single particle model of CDW
• Coexistence of superconductivity and charge density wave in a correlated regime
• Emergent quantum phenomena in two-dimensional 1T-TaS2
• Supercurrent effect in a charge density wave intertwined superconductor
• Metastable low energy states in TiS2, TiSe2, TiTe2 systems predicted with evolutionary algorithms
• Realignment of the charge-density wave in TiSe${}_2$ by variation of the conduction band population
• The attractive Hubbard model as an $SO(3)$ system of competing phases: supersolid order and its thermal melting
• Pressure induced superconductivity bordering a charge-density-wave state in NbTe4 with strong spinorbit coupling
• Revealing the anisotropic charge-density-wave order of TiSe${}_2$ through high harmonic generation
• Metal-to-insulator transition in Pt-doped TiSe${}_2$ driven by emergent network of narrow transport channels
• Excitonic Insulator and the Extended Falicov--Kimball Model Away from Half-Filling
• Direct evidence for two-gap superconductivity in hydrogen-intercalated titanium diselenide
• Emergence of charge density wave domain walls above the superconducting dome in TiSe2
• Revisiting the charge-density-wave superlattice of 1$T$-TiSe${}_2$
• Pressure-induced superconductivity in TiGeTe${}_6$