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We report the novel critical behavior of magnetization in low carrierconcentration systems UTeS and USeS that exhibit the large negativemagnetoresistance around the ferromagnetic transition temperatures T_C ~ 85 and23 K, respectively. UTeS and USeS crystallize in the same orthorhombicTiNiSi-type crystal structure as those of uranium ferromagnetic superconductorsURhGe and UCoGe. We determine the critical exponents, beta for the spontaneousmagnetization M_s, gamma for the magnetic susceptibility chi, and delta for themagnetization isotherm at T_C with several methods. The ferromagnetic states inUTeS and USeS have strong uniaxial magnetic anisotropy. However, the criticalexponents in the two compounds are different from those in thethree-dimensional Ising model with short-range magnetic exchange interactions.Similar sets of the critical exponents have been reported for the uraniumferromagnetic superconductors UGe_2 and URhGe, and uranium intermetallicferromagnets URhSi, UIr and U(Co_0.98Os_0.02)Al. The universality class of theferromagnetic transitions in UTeS and USeS may belong to the same one for theuranium compounds. The novel critical phenomenon associated with theferromagnetic transition is observed not only in the uranium intermetallicferromagnets with the itinerant 5f electrons but also in the low carrierconcentration systems UTeS and USeS with the localized 5f electrons. The largenegative magnetoresistance in UTeS and USeS, and the superconductivity in UGe_2and URhGe share the similarity of their closeness to the ferromagnetismcharacterized by the novel critical exponents.

physical review. b./physical review. b

Novel universality class for the ferromagnetic transition in the low  carrier concentration systems UTeS and USeS exhibiting large negative  magnetoresistance