Anisotropic resistivity and normal-state magnetoresistance of RNi{sub 2}B{sub 2}C (R=Y, Lu, Er, Ho)
- IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 OHE (United Kingdom)
- Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
Results of direct measurements of the in-plane and c-axis resistivity of single crystals of RNi{sub 2}B{sub 2}C (R=Y, Lu, Er, Ho) are presented. Despite the layered crystal structure, the resistivity of these materials is shown to be fundamentally isotropic. Small deviations from this isotropic behavior are observed below approximately 150 K for the compounds containing magnetic rare-earth ions (Er and Ho), probably due to crystal-electric-field effects. In addition, it is shown that the in-plane normal-state resistivity of ErNi{sub 2}B{sub 2}C and HoNi{sub 2}B{sub 2}C follows the same temperature dependence as that of the nonmagnetic materials (YNi{sub 2}B{sub 2}C and LuNi{sub 2}B{sub 2}C), but with an additional temperature-independent contribution (i.e., the resistivity of the magnetic compounds is shifted upwards by a few {mu}{Omega}cm). The observation of a striking negative longitudinal magnetoresistance for HoNi{sub 2}B{sub 2}C, which is not observed for LuNi{sub 2}B{sub 2}C, indicates that this difference is due to spin-disorder scattering. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 544906
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 56, Issue 17; Other Information: PBD: Nov 1997
- Country of Publication:
- United States
- Language:
- English
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