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

Published in Journal of Physics. Condensed Matter. 2009, vol. 21, p. 142202
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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Research group Groupe Giamarchi
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JARLBORG, Thomas N. Q-dependence of spin excitations in high-TC cuprates from spin–phonon coupling. In: Journal of Physics. Condensed Matter, 2009, vol. 21, p. 142202. https://archive-ouverte.unige.ch/unige:35712

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Deposited on : 2014-04-15

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