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Abstract:
Many exotic compounds, such as cuprate superconductors and heavy fermion
materials, exhibit a linear in temperature (T) resistivity, the origin
of which is not well understood. We found that the resistivity of the
quantum critical metal Sr3Ru2O7 is also T-linear at the critical
magnetic field of 7.9 T. Using the precise existing data for the Fermi
surface topography and quasiparticle velocities of Sr3Ru2O7, we show
that in the region of the T-linear resistivity, the scattering rate per
kelvin is well approximated by the ratio of the Boltzmann constant to
the Planck constant divided by 2 pi. Extending the analysis to a number
of other materials reveals similar results in the T-linear region, in
spite of large differences in the microscopic origins of the scattering.
