Symmetry of the superconducting gap in $HgBa_{2}CaCu_{2}O_{6+δ}$ single crystals from electronic Raman scattering

Details Symmetry of the superconducting gap in $HgBa_{2}CaCu_{2}O_{6+δ}$ single crystals from electronic Raman scattering Symmetry of the superconducting gap in $HgBa_{2}CaCu_{2}O_{6+δ}$ single crystals from electronic Raman scattering

1996-09-13

arxiv.org/abs/cond-mat/9609121v2

Europhys. Lett. 39 (1997) 207

Physics

Condensed Matter

paper withdrawn

Scientific paper

Pure electronic Raman spectra with no phonon structures superimposed to the electronic continuum, are reported for the first time, in optimally doped $HgBa_{2}CaCu_{2}O_{6+\delta } $ single crystals $(T_{c }=126 $ K). Our low temperature spectra (15 K) for the $A_{1g}$, $B_{1g} $ and $B_{2g} $ symmetries exhibit striking differences with previous data in $Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta }. $ The shape of the spectra for the various symmetries cannot be fitted by Devereaux's $d_{x^{2}-y^{2}} $ calculations, but strongly suggests a $d_{x y } $ gap, with its minima in the [100] and [010] directions.

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