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Evidence for an incommensurate magnetic resonance in La(2-x)Sr(x)CuO(4)

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arxiv cond-mat/0310231 v1 pith:BPEMPZK3 submitted 2003-10-10 cond-mat.supr-con cond-mat.str-el

J.M. Tranquada , C.H. Lee , K. Yamada , Y.S. Lee , L.P. Regnault , H.M. Ronnow This is my paper
classification cond-mat.supr-concond-mat.str-el
keywords incommensuratemagneticappliedfieldresonancealongbelowbroaden
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We study the effect of a magnetic field (applied along the c-axis) on the low-energy, incommensurate magnetic fluctuations in superconducting La(1.82)Sr(0.18)CuO(4). The incommensurate peaks at 9 meV, which in zero-field were previously shown to sharpen in q on cooling below T_c [T. E. Mason et al., Phys. Rev. Lett. 77, 1604 (1996)], are found to broaden in q when a field of 10 T is applied. The applied field also causes scattered intensity to shift into the spin gap. We point out that the response at 9 meV, though occurring at incommensurate wave vectors, is comparable to the commensurate magnetic resonance observed at higher energies in other cuprate superconductors.

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