Sereni, J. G. "New quantumcriticalpointrelated effects in Ce lattice systems." Physica B: Condensed Matter 354, no. 14 (2004): 331–337.
Abstract: Anomalous physical properties related to quantum critical points are investigated in Cesystems whose magnetic phase boundaries, TN,TC(x,p), can be traced for at least one decade of temperature. A change from the usual negative curvature to a linear concentration, x, dependence of TN,TC(x) is observed at x* greater than or equal to x(cr/2) (x(cr) being the critical concentration). Within the x* < x < x(cr) region, the usual specific heat temperature dependence Cm/T proportional to Ln (1/T) develops above TN,TC, while a nearly constant value of Cm/T maximum is observed besides a scaling of Cm/T(T) with DeltaT = T – TN,TC. Coincidentally, a significant increase of the zeropoint entropy S0(x)(= RLn 2 – Sm(x, T)) occurs. Dimensionality and dynamics of the spin fluctuations can be analyzed computing the internal energy and entropy for T greater than or equal to TN and ACsusceptibility results. Consequences for the freeenergy evolution within this region and implications of the S0(x) increase are discussed. (C) 2004 Elsevier B.V. All rights reserved.

Sereni, J. G. "Scaling properties of Celattice systems in their magnetic instability region." Physica B: Condensed Matter 320, no. 14 (2002): 376–379.
Abstract: In Celattice systems the magnetic phase transition is progressively dominated by magnetic instabilities as the ordering temperature (TN) is depressed by pressure (p) or alloying (z) the Celigands. The magnetic excitations, related to those instabilities, become the largest contribution to the specific heat (Cel/T) and the entropy (DeltaS(m)) at T > TN, as TN(z,p) vanishes in different manners: by approaching a quantum critical point at TN > 0 (caseI), at finite temperature (caseII) or TN remaining constant under z or p variation (caseIII). We show that in each case Cel/T and DeltaS(m) are scaled by different dependencies on the two characteristic temperatures: TN and T0 (the last related to the 4fband hybridization strength). Both energies depend on z or p in different forms. We observe that in caseI, Cel(z,p)/T and DeltaS(m) scale with DeltaT = T – TN, with T0 being only system dependent. For caseII we find a unique function for Cel/T(T > TN), independent of TN and T0, and for the caseIII DeltaS (T > TN) is scaled by T/T0(z, p), whereas TN only depends on the system. (C) 2002 Elsevier Science B.V. All rights reserved.

Sereni, J. G. "Magnetic Systems: Specific Heat." In Encyclopedia of Materials: Science and Technology, edited by K. H. J. Buschow, R. W. Cahn, M. C. Flemings, B. Ilschner, E. J. Kramer, S. Mahajan and P. VeyssiÃ¨re, 4986–4993. Vol. 5. Oxford: Elsevier, 2001.

Sereni, J. G. "Thermodynamical analysis of the magnetic phase diagrams of Ce systems." Journal of the Physical Society of Japan 70, no. 7 (2001): 2139–2150.
Abstract: Three types of magnetic phase diagrams as a function of composition or pressure, f (z, p), are identified among Ce systems: I) with the ordering temperature Tord > 0 monotonously, followed by a narrow region where nonFermiliquid (NFL) behavior is observed; II) with Tord vanishing at finite temperature, but followed by an extended NFL region, and III) where Tord remains nearly constant. Among the analyzed systems intrinsic differences are found in the evolution of their respective properties, namely: in group1 an increase of the density of excitations is observed below Tord. In groupII the evanescense of Tord(z, p) coincides with the extrapolation to zero of the magnetic free energy (DeltaG > 0), and the existence of a reference function implying that TK not equal f (z, p), whereas Tord = f (z, p). Finally, groupIII is also characterized by the evanescense of Tord where DeltaG > 0, but in this case Tord not equal f (z, p) whereas TK = f (z, p). The characteristics of each group are discussed and compared together with the different Cp(T)/T dependencies at T greater than or equal to Tord and some related scalings, which allow to recognize a quasiparamagnetic phase.

Sereni, J. G. "Evanescence of magnetic transitions in Ce systems." Physica B – Condensed Matter 281282 (2000): 337–339.
Abstract: Three types of magnetic phase diagrams can be identified in Ce systems: (I) with ordering temperature Tord > 0 continuously, followed by a narrow nonFermiliquid (NFL) region, (II) with Tord vanishing at finite temperature, followed by an extended NFL region, and (III) where the degrees of freedom condensed into the ordered phase decreases, without a concomitant decrease of Tord. Intrinsic differences are found in the way that the degrees of freedom condense at Tord and from the rising of the specific heat tails above Tord. (C) 2000 Elsevier Science B.V. All rights reserved.

Sereni, J. G. "Acitividades de Investigación en Física en San Carlos de Bariloche." Revista EspaÃ±ola de Física 13 (1999): 4.

Sereni, J. G. "Las variadas facetas del magnetismo incipiente en compuestos de Cerio." Revista EspaÃ±ola de Física 13 (1999): 25.

Sereni, J. G. "Inestabilidad de valencia, divergencias a temperatura nula y superconductividad en compuestos de cerio." In Anales de la Academia de Ciencias Exactas, Físicas y Naturales, 119. Vol. 50. Buenos Aires, 1998.

Sereni, J. G. "Comparative study of magnetic phase diagrams of Ce compounds." Journal of the Physical Society of Japan 67, no. 5 (1998): 1767–1775.
Abstract: Thermal properties of magnetically ordered Celattice systems are compared in their crossover to the nonmagnetic state, driven by alloying effects. The ordering temperature (Tord=TN or TC) is found to go to zero continuously only in a few cases, while in others a discontinuity in its decrease is clearly observed. Coincidentally, the magnetic contribution to the specific heat (Cp), the entropy and the free energy variations with temperature mark an evident difference between those cases. Furthermore, the extension of the nonfermiliquid (NFL) phase in terms of concentration variation correlates with differences observed in the respective ordered phase. A systematic transformation from a mean field like transition to a fluctuation dominated type is observed in Cp(T), as the system overcomes a characteristic crossover concentration. Such a concentration appears as a limit for the NFL behavior in the paramagnetic phase above Tord. A possible origin of the mentioned differences are discussed in terms of some alternatives in the evolution of the magnetic moments and the strength of their interactions.

Sereni, J. G. "CROSSOVER FROM MAGNETIC TO NONMAGNETIC GROUND STATE IN CE SYSTEMS." In Current Trends in Strongly Correlated Electron Systems, edited by S.K. Malik. Vol. 1. Plenum Press, 1995.
