paper

Nodes of the superconducting gap probed by electronic Raman scattering in HgBa_{2}CaCu_{2}O_{6+δ} single crystals

arXiv:cond-mat/9612052 · doi:10.1209/epl/i1997-00336-3

Abstract

Pure electronic Raman spectra with no phonon structures superimposed to the electronic continuum, are reported, in optimally doped HgBa_{2}CaCu_{2}O_{6+δ} single crystals (T_{c }=126 K). As a consequence, the spectra in the A_{1g }, B_{1g } and B_{2g } symmetries, including the crucial low energy frequency dependence of the electronic scattering, are directly and reliably measured. The B_{2g } and, most strikingly, the B_{1g } spectra exhibit a strong intrinsic linear term, which suggests that the nodes are shifted from the [110] and [1\bar{1}0] directions, a result inconsistent with a pure d_{x^{2}-y^{2}} model.

4 pages, revtex, 2 figures

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