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

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

2008-10-15

arxiv.org/abs/0810.2759v1

Phys. Rev. B, 78, 214505 (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.214505

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.

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