Evidence for an incommensurate magnetic resonance in La2-xSrxCuO4
We study the effect of a magnetic field (applied along the c axis) on the low-energy, incommensurate magnetic fluctuations in superconducting La1.82Sr0.18CuO4. 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 , 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.
Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan. Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan. MIT, Dept Phys, Cambridge, MA 02139 USA. CEA Grenoble, Dept Rech Fondamentale Mat Condensee, F-38054 Grenoble 9, France. Tranquada, JM, Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
Record created on 2007-01-24, modified on 2016-08-08