Point-contact tunneling spectroscopy measurement of CuₓTiSe₂: disorder-enhanced Coulomb effects
Luna, Katherine · Wu, Phillip M. · Chen, Justin S. · Morosan, Emilia · Beasley, Malcolm R.
Original · EN
We performed point-contact spectroscopy tunneling measurements on CuₓTiSe₂ 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 Tc₀ is close to the experimentally observed Tc.
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