Abstract
Abstract We report the low temperature magnetic properties of Cd-doped single crystals of Ce2RhIn8 grown from In-flux. Measurements of temperature-dependent magnetic susceptibility, heat capacity, electrical resistivity and X-ray magnetic scattering revealed that Cd-doping enhances the antiferromagnetic ordering temperature from T N = 2.8 to 4.8 K for crystals with nominal Cd-concentration of ~ 20 % . Similarly to the pure compound, Cd-doped Ce2RhIn8 presents just below T N a commensurate antiferromagnetic structure with a propagation vector η ⇒ = ( 1 2 , 1 2 , 0 ) . Comparisons between our results and the general effects of Cd-doping on the single layer related family CeMIn5 ( M = Co , Rh and Ir) will also be given.
Highlights
Superconducting heavy fermion materials belong to a class of correlated electron system where unconventional superconductivity (USC) is believed to be mediated by magnetic fluctuations [1,2]
The n 1⁄4 1 member of the family, CeMIn5 ð1 À 1 À 5Þ was largely studied, and the investigations using many types of chemical substitutions gave rise to very rich phase diagrams that have allowed a deeper understanding of the interplay between antiferromagnetism (AFM) and USC and its relationship with dimensionality and crystal structures [5,6,7,8,9,10]
The results of the susceptibility, heat-capacity and resistivity as a function of temperature revealed an enhancement of the Neel temperature from 2.8 K for pure compound to 4.8 K for Cd-doped sample
Summary
Superconducting heavy fermion materials belong to a class of correlated electron system where unconventional superconductivity (USC) is believed to be mediated by magnetic fluctuations [1,2]. The microscopic mechanisms of this electronic tuning of the ground state induced by Cdand Sn-doping are unclear and there is no definite conclusion about how these dopants affect the single ion anisotropy and the relative magnetic interaction of the neighboring Ce3þ ions. To help answer these questions it would be very elucidative to extent these kind of doping studies to other members of the CenMIn3nþ (M 1⁄4 Co; Rh; Ir; n 1⁄4 1; 2) series. We present the low temperature physical properties and a preliminary study of the magnetic structure on a Ce2RhIn8ÀxCdx sample with 20% Cd (nominal)
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