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College Park, Maryland      June 6 - 10 , 2004

TP67: Magnetic Excitation Spectrum in Ca2-xSrxRuO4

M.D. Lumsden (Condensed Matter Sciences Division, Oak Ridge National Laboratory), S. Wilson (Department of Physics and Astronomy, University of Tennessee), S.E. Nagler (Condensed Matter Sciences Division, Oak Ridge National Laboratory), P. Dai (Department of Physics and Astronomy, University of Tennessee; Condensed Matter Sciences Division, Oak Ridge National Laboratory), R. Jin (Condensed Matter Sciences Division, Oak Ridge National Laboratory), D. Mandrus (Condensed Matter Sciences Division, Oak Ridge National Laboratory; Department of Physics and Astronomy, University of Tennessee)

We have studied the concentration dependence on the magnetic excitation spectrum in single crystal samples of Ca2-xSrxRuO4 for 2>x>0.4. For large x, the spectrum is similar to that observed in pure Sr2RuO4 with incommensurate excitations strongly peaked in Q at (+/-0.3,+/-0.3,qz) consistent with Fermi-surface nesting wavevectors. As the concentration approaches the quantum critical point at x=0.5, the spectrum evolves into a multipeak structure in Q centered around the 2d ferromagnetic zone center. The spectrum observed near the quantum critical concentration is qualitatively quite similar to that observed in Sr3Ru2O7 which is also in the vicinity of a quantum critical point.

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