On the nature of the superconducting gap in the cuprates

Details On the nature of the superconducting gap in the cuprates On the nature of the superconducting gap in the cuprates

2001-06-13

arxiv.org/abs/cond-mat/0106251v2

J. Phys.: Condens. Matter 14 (1 July 2002) 6591-6600

Physics

Condensed Matter

Superconductivity

11 pages, including 2 figures. Revised version: corrected typos; improved presentation; some additional discussion; new append

Scientific paper

10.1088/0953-8984/14/25/325

Recent experiments indicate that the excitation spectrum of the cuprates is characterised, in the superconducting state, by two energy scales: the ``coherence energy'' \Delta_c and the ``pseudogap'' \Delta_p. Here we consider a simple generalisation of the BCS model that yields exotic pairing and can describe, phenomenologically, the generic trends in the critical temperature T_c of cuprate superconductors. We use the model to predict the gap in the single-particle spectrum arising from the superconductivity and we find evidence that it corresponds to the lower of the two energy scales, \Delta_c, seen in the experiments. This supports the view that the origin of the pseudogap is not superconducting fluctuations.

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