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Pressure evolution of the magnetic field induced ferromagnetic fluctuation through the pseudo-metamagnetism of CeRu$$_2$$Si$$_2$$

Aoki, Dai*; Paulsen, C.*; Matsuda, Tatsuma; Malone, L.*; Knebel, G.*; Haen, P.*; Lejay, P.*; Settai, Rikio*; Onuki, Yoshichika; Flouquet, J.*

Resistivity measurements performed under pressure in the paramagnetic ground state of CeRu$$_2$$Si$$_2$$ are reported. They demonstrate that the relative change of effective mass through the pseudo metamagnetic transition is invariant under pressure. The results are compared with the first order metamagnetic transition due to the antiferromagnetism of Ce$$_{0.9}$$La$$_{0.1}$$Ru$$_2$$Si$$_2$$ which corresponds to the "negative" pressure of CeRu$$_2$$Si$$_2$$ by volume expansion. Finally, we describe the link between the spin-depairing of quasiparticles on CeRu$$_2$$Si$$_2$$ and that of Cooper pairs on the unconventional heavy fermion superconductor CeCoIn$$_5$$.

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Category:Physics, Multidisciplinary

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