What is it about?
Glue for formation of Cooper pair is an unsolved problem in High-Tc superconductors. In this work, we obtained information of a Bosonic mode by inelastic tunneling experiment performed using a scanning tunneling microscope. The results suggest the mode to be of magnetic origin.
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Why is it important?
Tunneling spectroscopy is a well known technique for directly probing the bosonic modes in superconductors. Scanning tunneling experiments offer opportunities to detect this mode at different locations on the superconducting surface. Our data on NdBa2Cu3O7 (Nd-123) superconductors with CuO2-plane and CuO-chain layers show very similar feature as for Bi-2212 with only CuO2-planes in unit cells. Thus our data shows the generality of features in tunneling spectroscopy data of CuO2-layer based superconductors.
Perspectives
The experiments were performed at 4.2 K in He-gas environment with a home-made STM. The collaborative work between University of Saarland, Forschungszentrum Karlsruhe and Max Planck Institute for Chemical Physics of Solids helped us understand the general tunneling spectroscopic features of cuprate superconductors and detect a bosonic mode. I hope the theoreticians and experimentalists solving the problem of glue for Cooper pair in cuprate superconductors will be benefitted from this research.
Pintu Das
Indian Institute of Technology Delhi
Read the Original
This page is a summary of: Excitation of a bosonic mode by electron tunneling into a cuprate superconductor NdBa 2 Cu 3 O 7 − δ , Physical Review B, December 2008, American Physical Society (APS),
DOI: 10.1103/physrevb.78.214505.
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