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 $T_c$.

4 pages, 4 figures

References in corpus (4)

• Semimetal to semimetal charge density wave transition in 1T-TiSe${}_2$
• Emergence of Fermi pockets in an excitonic CDW melted novel superconductor
• Evolution of the Electronic Structure of 1T-CuxTiSe2
• Varying Cu-Ti hybridization near the Fermi energy in Cu${}_x$TiSe${}_2$: Results from supercell calculations

Cited by in corpus (2)

• Stripe and short range order in the charge density wave of 1T-Cu${}_x$TiSe${}_2$
• Superconductivity and hybrid soft modes in TiSe${}_2$