Excitation of a bosonic mode by electron tunneling into a cuprate superconductor

Abstract

We performed scanning tunneling spectroscopic experiments on hole-doped NdBa${}_2$Cu${}_3$O${}_{7-\delta }$. The d$I$/d$V$ curves obtained at 4.2 K are asymmetric with clear peak-dip and hump structures. Energy derivatives of these curves show peaks at energies beyond the dip features. Highly precise full potential bandstructure calculations confirm a featureless electronic density of states in that energy region. Our results indicate that tunneling electrons couple to a collective mode in the CuO${}_2$ plane.

5 pages, 4 figures

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Cited by in corpus (1)

• Effect of spin excitations on the property of quasiparticles in electron-doped cuprates