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We investigate whether the spin or charge degrees of freedom are responsiblefor the nodal gap in underdoped cuprates by performing inelastic neutronscattering and x-ray diffraction measurements on La$_{2-x}$Sr$_x$CuO$_4$, whichis on the edge of the antiferromagnetic phase. We found that fluctuatingincommensurate spin-density-wave (SDW) with a the bottom part of an hourglassdispersion exists even in this magnetic sample. The strongest component ofthese fluctuations diminishes at the same temperature where the nodal gapopens. X-ray scattering measurements on the same crystal show no signature ofcharge-density-wave (CDW). Therefore, we suggest that the nodal gap in theelectronic band of this cuprate opens due to fluctuating SDW with nocontribution from CDW.

Opening a nodal gap by fluctuating spin-density-wave in lightly doped La$_{2-x}$Sr$_x$CuO$_4$