We show that single-crystalline Sr 3 Ru 2 O 7 grown by a floating-zone technique is an isotropic paramagnet and a quasi-two-dimensional metal, as spin-triplet superconducting Sr 2 RuO 4 is. The ground state is a Fermi liquid with very low residual resistivity (Ϸ3 ⍀ cm for in-plane currents͒ and a nearly ferromagnetic metal with the largest Wilson ratio R W у10 among paramagnets so far. This contrasts with the ferromagnetic order at T c ϭ104 K reported on single crystals grown by a flux method ͓Cao et al., Phys. Rev. B 55, R672 ͑1997͔͒. However, we have found a dramatic changeover from paramagnetism to ferromagnetism under applied pressure. This suggests the existence of a substantial ferromagnetic instability in the Fermi-liquid state. RAPID COMMUNICATIONS R6090PRB 62 IKEDA, MAENO, NAKATSUJI, KOSAKA, AND UWATOKO

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Single crystals of a highly conductive oxide SrMoO3 have been grown by a floating-zone method under argon atmosphere with ultralow oxygen partial pressure p(O2)∼10−25atm. The obtained single crystals of SrMoO3 reveal quite low resistivity at 300 K ρ(300K)=5.1μΩcm, which is the lowest to date in the values of ρ(300K) of all the oxides. Resistivity and specific heat data suggest that electrons in SrMoO3 behave as the Fermi liquid (correlated electron), and that its low resistivity is due to the extremely small electron-phonon interaction in SrMoO3.

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