Field-induced paramagnons at the metamagnetic transition in Ca1.8Sr0.2RuO4

Details Field-induced paramagnons at the metamagnetic transition in Ca1.8Sr0.2RuO4 Field-induced paramagnons at the metamagnetic transition in Ca1.8Sr0.2RuO4

2007-03-30

arxiv.org/abs/cond-mat/0703806v1

Phys. Rev. Lett. 99, 217402 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.99.217402

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 ransition, paramagnon and finally well-defined magnon scattering is induced, partially suppressing the incommensurate signals. The high-field phase in Ca1.8Sr0.2RuO4 has, therefore, to be considered as an intrinsically ferromagnetic state stabilized by the magnetic field.

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