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Millimeter-sized Ce$_2$Rh$_{3+\delta}$Sb$_4$ ($\delta\approx 1/8$) singlecrystals were synthesized by a Bi-flux method and their physical propertieswere studied by a combination of electrical transport, magnetic andthermodynamic measurements. The resistivity anisotropy$\rho_{a,b}/\rho_{c}\sim2$, manifesting a quasi-one-dimensional electroniccharacter. Magnetic susceptibility measurements confirm $\mathbf{ab}$ as themagnetic easy plane. A long-range antiferromagnetic transition occurs at$T_N=1.4$ K, while clear short-range ordering can be detected well above $T_N$.The low ordering temperature is ascribed to the large Ce-Ce distance as well asthe geometric frustration. Kondo scale is estimated to be about 2.4 K,comparable to the strength of magnetic exchange. Ce$_2$Rh$_{3+\delta}$Sb$_4$,therefore, represents a rare example of dense Kondo lattice whoseRuderman-Kittel-Kasuya-Yosida exchange and Kondo coupling are both weak butcompeting.

Synthesis and physical properties of Ce$_2$Rh$_{3+\delta}$Sb$_4$ single crystals