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

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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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