Field-induced paramagnons at the metamagnetic transition of Ca1.8Sr0.2RuO4 |
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Authors: | Steffens P Sidis Y Link P Schmalzl K Nakatsuji S Maeno Y Braden M |
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Affiliation: | II. Physikalisches Institut, Universit?t zu K?ln, Zülpicher Strasse 77, D-50937 K?ln, Germany. |
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Abstract: | The magnetic excitations in Ca1.8Sr0.2RuO4 were studied across the metamagnetic transition and as a function of temperature using inelastic neutron scattering. At low temperature and low magnetic field the magnetic response is dominated by a complex superposition of incommensurate antiferromagnetic fluctuations. Upon increasing the magnetic field across the metamagnetic transition, paramagnon and finally well-defined magnon scattering is induced, partially suppressing the incommensurate signals. The high-field phase in Ca1.8Sr0.2RuO4, therefore, has to be considered as an intrinsically ferromagnetic state stabilized by the magnetic field. |
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