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Abstract:
We present inelastic neutron scattering measurements on the ruthenate Sr1.6Ba0.4RuO4 which is on the hitherto almost unknown Ba-substituted side of the doping phase diagram of Sr(2-x)Ae(x)RuO(4) (Ae = Ca, Ba). Unlike the Ca-substituted side of the phase diagram no (quasi) static magnetic peaks can be observed in Sr1.6Ba0.4RuO4. Instead, incommensurate spin fluctuations can be observed around q(0) = (+/- 0.3,+/- 0.3,0).Both the absolute intensity of. chi" (Q,omega) and its energy and temperature dependence as well as the anisotropy ratio. chi(c)"/chi(a, b)" resemble the ones in Sr2RuO4. Hence, a random potential implied by the substitution of huge Ba ions as well as the induced increase of interatomic distances has less impact on the magnetic properties than octahedral tilts implied by Ca substitution. Moreover, any ferromagnetic spin fluctuations are either absent in Sr1.6Ba0.4RuO4 or below the detection limit.
