College Park, Maryland      June 6 - 10 , 2004

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TP67: Magnetic Excitation Spectrum in Ca_2-xSr_xRuO₄

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 Ca_2-xSr_xRuO₄ 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,q_z) 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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