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We present a complete characterization of ferromagnetic system CeIr2B2 usingpowder x-ray diffraction XRD, magnetic susceptibility chi(T), isothermalmagnetization M(H), specific heat C(T), electrical resistivity rho(T,H), andthermoelectric power S(T) measurements. Furthermore 11B NMR study was performedto probe the magnetism on a microscopic scale. The chi(T), C(T) and rho(T) dataconfirm bulk ferromagnetic ordering with Tc = 5.1 K. Ce ions in CeIr2B2 are instable trivalent state. Our low-temperature C(T) data measured down to 0.4 Kyield Sommerfeld coefficient gamma = 73(4) mJ/molK2 which is much smaller thanthe previously reported value of gamma = 180 mJ/molK2 deduced from the specificheat measurement down to 2.5 K. For LaIr2B2 gamma = 6(1) mJ/molK2 which impliesthe density of states at the Fermi level D(EF) = 2.54 states/(eV f.u.) for bothspin directions. The renormalization factor for quasi-particle density ofstates and hence for quasi-particle mass due to 4f correlations in CeIr2B2 is12. The Kondo temperature TK ~ 4 K is estimated from the jump in specific heatof CeIr2B2 at Tc. Both C(T) and rho(T) data exhibit gapped-magnon behavior inmagnetically ordered state with an energy gap Eg ~ 3.5 K. The rho data as afunction of magnetic field H indicate a large negative magnetoresistance (MR)which is highest for T = 5 K.While at 5 K the negative MR keeps on increasingup to 10 T, at 2 K an upturn is observed near H = 3.5 T. On the other hand, thethermoelectric power data have small absolute values (S ~ 7 {\mu}V/K)indicating a weak Kondo interaction. A shoulder in S(T) at about 30 K followedby a minimum at ~ 10 K is attributed to crystal electric field (CEF) effectsand the onset of magnetic ordering. 11B NMR line broadening provides strongevidence of ferromagnetic correlations below 40 K.

Ferromagnetic Ordering in CeIr2B2: Transport, magnetization, specific heat and NMR studies