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Q-dependence of spin excitations in high-TC cuprates from spin–phonon coupling

Published inJournal of physics. Condensed matter, vol. 21, 142202
Publication date2009
Abstract

An understanding of spin excitations in cuprates is essential since the mechanism of high-TC superconductivity might be linked to spin fluctuations. Band calculations for ‘one-dimensional' unit cells of La2CuO4 show larger coupling (spin–phonon coupling, SPC) between anti-ferromagnetic spin waves and O-phonons than for Cu- or La-phonons. When this result is applied to a two-dimensional, free-electron like band, it leads to an ‘hourglass' shape of the spin excitation spectrum, as in recent experiments. Isotope shifts and doping dependences of the excitations are discussed.

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Citation (ISO format)
JARLBORG, Thomas N. Q-dependence of spin excitations in high-T<sub>C</sub> cuprates from spin–phonon coupling. In: Journal of physics. Condensed matter, 2009, vol. 21, p. 142202. doi: 10.1088/0953-8984/21/14/142202
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ISSN of the journal0953-8984
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