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

Phys. Rev. B 95, 104512 (2017) We investigate whether the spin or charge degrees of freedom are responsible for the nodal gap in underdoped cuprates by performing inelastic neutron scattering and x-ray diffraction measurements on La$_{2-x}$Sr$_x$CuO$_4$, which is on the edge of the antiferromagnetic...

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Main Authors Kapon, Itzik, Ellis, David S, Drachuck, Gil, Bazalitski, Galina, Weschke, Eugen, Schierle, Enrico, Strempfer, Jörg, Niedermayer, Christof, Keren, Amit
Format Journal Article
LanguageEnglish
Published 20.12.2016
Subjects
Physics - Superconductivity
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Summary:Phys. Rev. B 95, 104512 (2017) We investigate whether the spin or charge degrees of freedom are responsible for the nodal gap in underdoped cuprates by performing inelastic neutron scattering and x-ray diffraction measurements on La$_{2-x}$Sr$_x$CuO$_4$, which is on the edge of the antiferromagnetic phase. We found that fluctuating incommensurate spin-density-wave (SDW) with a the bottom part of an hourglass dispersion exists even in this magnetic sample. The strongest component of these fluctuations diminishes at the same temperature where the nodal gap opens. X-ray scattering measurements on the same crystal show no signature of charge-density-wave (CDW). Therefore, we suggest that the nodal gap in the electronic band of this cuprate opens due to fluctuating SDW with no contribution from CDW.
DOI:10.48550/arxiv.1612.06864