2001/09/04 by A. D. Christianson, A. H. Lacerda, A. Lacerda +3 · 4 citations
Chemistry · Materials Science · Physics and Astronomy · #Inorganic Chemistry and Materials #Magnetic Properties of Alloys #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.66.054410
submitted to Physical Review B
arxiv created 2001/09/04 · openalex publication_date 2002/08/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report measurements of the temperature-dependent anisotropic resistivity and in-plane magnetoresistance on single crystals of the tetragonal heavy-fermion antiferromagnet (TN=3.8K) CeRhIn5. The measurements are reported in the temperature range 1.4--300 K and in magnetic fields to 18 T. The resistivity is moderately anisotropic, with a room-temperature c-axis to in-plane resistivity ratio \ensuremathρc/\ensuremathρa(300K)=1.7. \ensuremathρ(T) measurements on the nonmagnetic analog LaRhIn5 indicate that the anisotropy in the CeRhIn5 resistivity stems predominantly from anisotropy in Kondo-derived magnetic scattering. In the magnetically ordered regime, an applied field H reduces TN only slightly due to the small ordered moment (0.37\ensuremathμB) and magnetic anisotropy. The magnetoresistance (MR) below TN is positive and shows little sign of saturating in fields to 18 T. In the paramagnetic state, a positive MR is present below 7.5 K, while a high-field negative contribution is evident at higher temperatures. The positive contribution decreases in magnitude with increasing temperature. Above 40 K the positive contribution is no longer observable, and the MR is negative. The low-T positive MR results from interactions with the Kondo-coherent state, while the high-T negative MR stems from single-impurity effects. In general, these results indicate that CeRhIn5 exhibits a modest degree of transport anisotropy not atypical among heavy-fermion compounds.