Evolution of Fermi-Liquid Interactions in Sr2RuO4 under Pressure

Forsythe, D.; Julian, S. R.; Bergemann, C.; Pugh, E.; Steiner, M. J.; Alireza, P. L.; McMullan, G. J.; Nakamura, F.; Haselwimmer, R. K. W.; Walker, I. R.; Saxena, S. S.; Lonzarich, G. G.; Mackenzie, A. P.; Mao, Z. Q.; Maeno, Y.

doi:10.1103/PhysRevLett.89.166402

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Evolution of Fermi-Liquid Interactions in Sr₂RuO₄ under Pressure

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Forsythe, D., Julian, S. R., Bergemann, C., Pugh, E., Steiner, M. J., Alireza, P. L., et al. (2002). Evolution of Fermi-Liquid Interactions in Sr₂RuO₄ under Pressure. Physical Review Letters, 89(16): 166402, pp. 1-4. doi:10.1103/PhysRevLett.89.166402.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-EFB8-E

Abstract

We have measured the temperature and field dependence of the resistivity of the unconventional superconductor Sr2RuO4 at pressures up to 3.3 GPa. Using the Shubnikov-de Haas effect, we find that the Fermi surface sheet believed to be primarily responsible for superconductivity becomes more two-dimensional with increasing pressure, a surprising result that is, however, consistent with a recent model of orbital-dependent superconductivity in this system. Many-body enhancements and the superconducting transition temperature all fall gradually with increasing pressure, contrary to previous suggestions of a ferromagnetic quantum critical point at similar to3 GPa.