Point-contact tunneling spectroscopy measurement of Cu${}_x$TiSe${}_2$: disorder-enhanced Coulomb effects

Abstract

We performed point-contact spectroscopy tunneling measurements on Cu${}_x$TiSe${}_2$ bulk with $x=0.02$ and $0.06$ at temperatures ranging from $T=4-40$ K and observe a suppression in the density of states around zero-bias that we attribute to enhanced Coulomb interactions due to disorder. We find that the correlation gap associated with this suppression is related to the zero-temperature resistivity. We use our results to estimate the disorder-free transition temperature and find that the clean limit $T_{c0}$ is close to the experimentally observed $T_c$.

arXiv comment4 pages, 4 figures

References in corpus (9)

• Superconductivity in Cu_xTiSe_2
• Semimetal to semimetal charge density wave transition in 1T-TiSe${}_2$
• Emergence of Fermi pockets in an excitonic CDW melted novel superconductor
• Polaronic hole-trapping in doped $\mathrm{BaBi}{\mathrm{O}}_3$
• Evolution of the Electronic Structure of 1T-CuxTiSe2
• Anisotropic properties of the layered superconductor Cu0.07TiSe2
• Heat Capacity of Single Crystal CuxTiSe2 Superconductors
• Disorder Driven Metal-Insulator Transition in BaPb${}_{1-x}$Bi${}_x$O${}_3$ and Inference of Disorder-Free Critical Temperature
• Varying Cu-Ti hybridization near the Fermi energy in Cu${}_x$TiSe${}_2$: Results from supercell calculations

Cited by in corpus (6)

• Ultrafast charge ordering by self-amplified exciton-phonon dynamics in TiSe${}_2$
• Stripe and short range order in the charge density wave of 1T-Cu${}_x$TiSe${}_2$
• Superconductivity and hybrid soft modes in TiSe${}_2$
• Charge Density Wave Hampers Exciton Condensation in 1T-TiSe${}_2$
• Superconductivity in systems exhibiting the Altshuler-Aronov anomaly
• States-conserving density of states for Altshuler-Aronov effect: Heuristic derivation