Doping and temperature dependence of incommensurate antiferromagnetism in underdoped lanthanum cuprates

Details Doping and temperature dependence of incommensurate antiferromagnetism in underdoped lanthanum cuprates Doping and temperature dependence of incommensurate antiferromagnetism in underdoped lanthanum cuprates

2001-09-04

arxiv.org/abs/cond-mat/0109058v1

Phys. Rev. B64, 224505 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, PDF file, six figures are included, accepted for publication in Physical Review B

Scientific paper

10.1103/PhysRevB.64.224505

The doping, temperature and energy dependence of the dynamical spin structure factors of the underdoped lanthanum cuprates in the normal state is studied within the t-J model using the fermion-spin transformation technique. Incommensurate peaks are found at $[(1\pm\delta)\pi,\pi]$, $[\pi,(1\pm\delta)\pi]$ at relatively low temperatures with $\delta$ linearly increasing with doping at the beginning and then saturating at higher dopings. These peaks broaden and weaken in amplitude with temperature and energy, in good agreement with experiments. The theory also predicts a rotation of these peaks by $\pi/4$ at even higher temperatures, being shifted to $[(1\pm \delta/\sqrt{2})\pi,(1\pm \delta/\sqrt{2})\pi]$.

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