2 FIG. 2: (Color online) Effect of applied magnetic field on the electrical resistivity. (a) involving both magnetic transitions and (b) showing the hysteresis of the lower ( T C ) first order transition. FIG. 1: (Color online) Effect of applied magnetic field up to 4T on the specific heat after phonon subtraction. Arrows indicate the field dependence of the lower ( T C ) transition. II. EXPERIMENTAL DETAILS AND RESULTS less, the cusp of M ( T ) at that temperature reveals that some type of AF interactions play some role in the magnetic structure below T$_{M}$ . The lack of varia- tion of C$_{m}$ ( T ) for fields B ≤ 0 . 2 T indicates that the arguments used in Ref.[8] to recognize the formation of Ce-Ce pairs remains valid at low field. At higher field (i.e. B ≥ 0 . 5 T ) the maximum value of C$_{m}$ ( T$_{M}$ ) starts to decrease with a concomitant broadening of the anomaly, see Fig. 1. Such a behavior indicates that an induced ferromagnetic state sets in, which at B = 4T clearly tends to a Schottky-type anomaly. According to the C$_{m}$ ( T ) /T behavior depicted in Fig. 1, the temperature dependence of the magnetic entropy gain S$_{m}$ reduces its thermal increase as the external field increases. Independently of that reduc- tion, S$_{m}$ ( T ) reaches the full expected value of 2RLn2 at T ≈ 20 K even for B = 1 T . For highest measured field (c.f. B = 4 T) only 80% of the total entropy of the doublet GS is reached at that temperature (c.f. our upper limit of temperature). ρ ( T, B ) measurements, shown in Fig. 2a, indicate that magnetic correlations above T$_{M}$ are progressively quenched by magnetic field and the transition itself is smeared once the applied field induces the FM behav- ior. Concerning the lower transition, the ρ ( T ) hystere- The fact that the jump of the specific heat remains unaffected and the temperature of the maximum value of C$_{m}$ (at T = T$_{M}$ ) does not decrease up to B = 0 . 2 T are further evidences that the upper transition cannot be considered as AF in a canonical sense. Neverthe- As shown in Fig. 1, the magnetic field affects quite differently the specific heat C$_{m}$ ( T ) anomalies of both transitions. While the temperature of the lowest ( T$_{C}$ = 2 . 1 K) rapidly increases with field, the upper one ( T$_{M}$ = 4 . 8 K) reminds practically unaffected up to B = 0 . 2T. The well defined first order transition at T$_{C}$ ( B = 0) transforms into a broaden anomaly by the effect of applied field, which extends between 2 ≤ T ≤ 3 K for B = 0 . 1 T, see Fig. 1. Such a broad- ening can be explained by the poly-crystalline nature of the sample since the crystals are randomly oriented between the easy and hard directions of magnetiza- tion. This random orientation yields to a continuous distribution of transitions according to the respective projections of the crystals respect to the magnetic field. Specific heat was measured using the heat pulse technique in a semi-adiabatic He-3 calorimeter in the range between 0.5 and 20K, at zero and applied mag- netic field up to 4T. DC-magnetization measurements were carried out using a standard SQUID magnetome- ter operating between 2 and 300K, and as a function of field up to 5T. Electrical resistivity was measured between 0.5K and room temperature using a standard four probe technique with an LR700 bridge. Details of sample preparation were described in a previous paper [8]. Structural characterization con- firms the single phase composition of the sample in a tetragonal Mo 2 FeB 2 -type structure with a = 7 . 765 ˚ A and c = 3 . 902 ˚ A lattice parameters. The actual composition of the sample was determined to be Ce 2 . 005 Pd 1 . 988 Sn 0 . 997 after SEM/EDAX analysis.