Abstract
We performed scanning tunneling spectroscopic experiments on hole-doped NdBa2Cu3O7-δ. The dI/dV 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 band-structure 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 CuO2 plane.
Original language | English |
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Article number | 214505 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 78 |
Issue number | 21 |
DOIs | |
Publication status | Published - 2008 Dec 1 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics