Anisotropic three-dimensional magnetic fluctuations in heavy fermionCeRhIn5

Abstract

${\mathrm{CeRhIn}}_5$ is a heavy fermion antiferromagnet that orders at 3.8 K. The observation of pressure-induced superconductivity in ${\mathrm{CeRhIn}}_5$ at a very high $T_C$ of 2.1 K for heavy fermion materials has led to speculations regarding its magnetic fluctuation spectrum. Using magnetic neutron scattering, we report anisotropic three-dimensional antiferromagnetic fluctuations with an energy scale of less than 1.7 meV for temperatures as high as ${3T}_C.$ In addition, the effect of the magnetic fluctuations on electrical resistivity is well described by the Born approximation.