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

Shin-Ichi Ikeda·Yoshiteru Maeno·Satoru Nakatsuji·Masashi Kosaka·Yoshiya Uwatoko
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Abstract

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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Shin-Ichi Ikeda, Yoshiteru Maeno, Satoru Nakatsuji, Masashi Kosaka, Yoshiya Uwatoko. 2000-07-05. The ground state of Sr3Ru2O7 revisited; Fermi liquid close to a ferromagnetic instability. https://doi.org/10.1103/physrevb.62.r6089

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