Issue |
Europhys. Lett.
Volume 54, Number 3, May 2001
|
|
---|---|---|
Page(s) | 373 - 379 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2001-00252-0 | |
Published online | 01 December 2003 |
Gap and subgap tunnelling in cuprates
1
Department of Physics, Loughborough University
Loughborough LE11 3TU, UK
2
P.L. Kapitza Institute for Physical Problems
Kosygin st. 2, 117973 Moscow, GSP-1, Russia
Received:
4
January
2001
Accepted:
19
February
2001
We describe strongly attractive carriers in cuprates in the framework of a simple quasi-one-dimensional Hamiltonian with a local attraction. In contrast with the conventional BCS theory, there are two energy scales, a temperature-independent incoherent gap and a temperature-dependent coherent gap combining into one temperature-dependent global gap . The temperature dependence of the gap and single-particle (Giaver) tunnelling spectra in cuprates are quantitatively described. Two distinct energy scales observed in Giaver tunnelling and electron-hole reflection experiments are understood and their link with the zero-bias conductance peak and the symmetry of the order parameter is discussed.
PACS: 74.20.-z – Theories and models of superconducting state / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects
© EDP Sciences, 2001
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