Evidence for a transition from a bulk Meissner-state to a spontaneous vortex phase in RuSr₂GdCu₂O₈ from DC magnetisation measurements
Bernhard, C. · Tallon, J. L. · Brücher, E. · Kremer, R. K.
Original · EN
From magnetisation measurements we provide evidence that the ferromagnetic superconductor RuSr₂GdCu₂O₈ with itTc=45 K and itTₘ=137 K exhibits a sizeable diamagnetic signal at low temperature (itT<itTitms=30 K) and low magnetic field (itHext<30 Oe), corresponding to a bulk Meissner-phase. At intermediate temperatures, itTitms<itT<itTc, a spontaneous vortex phase forms which is characterized by unique thermal hysteresis effects. We argue that a recent negative report [C.W. Chu et al., cond-mat/9910056] regarding the Meissner-effect in Ru-1212 can be explained by impurity scattering or grain size effects.
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