The ground state of Sr3Ru2O7 revisited; Fermi liquid close to a ferromagnetic instability

Details The ground state of Sr3Ru2O7 revisited; Fermi liquid close to a ferromagnetic instability The ground state of Sr3Ru2O7 revisited; Fermi liquid close to a ferromagnetic instability

2000-02-10

arxiv.org/abs/cond-mat/0002147v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to be published in Phys. Rev. B : Rapid com

Scientific paper

10.1103/PhysRevB.62.R6089

We show that single-crystalline Sr3Ru2O7 grown by a floating-zone technique is an isotropic paramagnet and a quasi-two dimensional metal as spin-triplet superconducting Sr2RuO4 is. The ground state is Fermi liquid with very low residual resistivity (3 micro ohm cm for in-plane currents) and a nearly ferromagnetic metal with the largest Wilson ratio Rw>10 among paramagnets so far. This contrasts with the ferromagnetic order at Tc=104 K reported on single crystals grown by a flux method [Cao et al., Phys. Rev. B 55, R672 (1997)]. We have also found a dramatic changeover from paramagnetism to ferromagnetism under applied pressure. This suggests the existence of a substantial ferromagnetic instability on the verge of a quantum phase transition in the Fermi liquid state.

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