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Abstract:
We report a detailed study of the Hall effect in Sr2RuO4, the first
layered perovskite superconductor which does not contain copper (T-c
congruent to 1 K). The Hall coefficient (R(H)) was measured at
temperatures between 20 mK and 300 K, and an unusual dependence of R(H)
on the applied magnetic field was observed. R(H) has a strong
temperature dependence below 25 K, but below 1 K it saturates at a value
of -1.15x10(-10) m(3)/C. The Fermi surface of Sr2RuO4 is known from
quantum oscillation measurements, and since it is nearly two
dimensional, it is possible to derive a simple expression for R(H) using
methods developed by Ong [Phys. Rev. B 43, 193 (1991)]. We show that if
the mean free path, l, is assumed to be isotropic at low temperatures,
it is possible to make an accurate quantitative calculation of R(H) on
the basis of the known Fermi surface parameters.
