Sereni, J. G., G. Nieva, and J. P. Kappler. "ANOMALOUS CRYSTALFIELD EFFECTS IN THE SPECIFICHEAT OF CEHEAVY FERMION COMPOUNDS." Journal of Magnetism and Magnetic Materials 6364 (1987): 101–103.

KAPPLER, J. P., G. SCHMERBER, and J. G. SERENI. "CERIUM MAGNETICBEHAVIOR IN CE(PD,M) WITH M = CO, NI, RH, IR, PT, CU, AG AND AU." Journal of Magnetism and Magnetic Materials 767 (1988): 185–186.

Sereni, J. G., O. Trovarelli, G. Schmerber, and J. P. Kappler. "Coexistence of magnetic order and heavy fermion behavior in Ce7X3." Journal of Magnetism and Magnetic Materials 108, no. 13 (1992): 183–184.
Abstract: Low temperature specific heat and magnetic susceptibility measurements on Ce7X3 (X = Rh, Ni) compounds are reported. Ce7Rh3 shows an onset of spontaneous magnetization at 7.2 K. About 40% of the expected R ln 2 entropy gain is found in the paramagnetic phase, related to a gamma(HT) = 1.1 J/K2 mol specific heat coefficient. In Ce7Ni3 an antiferromagnetic transition is observed at 1.7 K, superimposed to a large C(p)/T electronic contribution, described by a gamma(HT) = 0.9 J/K2 mol coefficient for T > 10 K. These results are interpreted in terms of the three different crystal sublattices of Ce. The entropy gain related to each transition allows to identify the behaviour of each sublattice. In the case of Ce7Ni3 one sublattice behaves as a heavy fermion system, with a value of C(p)/T = 3.3 J/K2 Ce at. Such a behaviour is confirmed under an applied magnetic field.

Sereni, J. G., G. Nieva, J. G. Huber, E. Braun, F. Oster, E. Bruck, B. Roden, and D. Wohlleben. "Evidence for 4finstability of dilute terbium in thorium." Journal of Magnetism and Magnetic Materials 6364 (1987): 597–599.
Abstract: We have measured the specific heat of dilute Th1?xTbx alloys (0.44 < x < 2.15 a/o), which rises linearly between 0.4 and 0.9 K with a slope of ?C/T ? 450 mJ/K2molTb followed by a Schottky anomaly with a maximum near 3.8 K. The high temperature ??T product was found to be 4% lower than that of Tb3+. The resistivity shows no minimum at low temperatures. Discussion is made in terms of nonintegral valence of Tb.

Facio, J. I., D. Betancourth, N. R. Cejas Bolecek, G. A. Jorge, P. Pedrazzini, V. F. Correa, P. S. Cornaglia, V. Vildosola, and García D.J. "Lattice specific heat for the RMIn5 (R=Gd, La,Y; M=Co, Rh) compounds: Nonmagnetic contribution subtraction." Journal of Magnetism and Magnetic Materials 407 (2016): 406–4011.

Betancourth, D., J. I. Facio, P. Pedrazzini, C. B. R. Jesus, P. G. Pagliuso, V. Vildosola, P. S. Cornaglia, D. J. García, and V. F. Correa. "Low Temperature magnetic properties of GdCoIn5." Journal of Magnetism and Magnetic Materials 374 (2015): 744–747.
Abstract: A comprehensive experimental and theoretical study of the low temperature properties of GdCoIn5 was performed. Specific heat, thermal expansion, magnetization and electrical resistivity were measured in good quality single crystals down to 4He temperatures. All the experiments show a secondorderlike phase transition at 30 K probably associated with the onset of antiferromagnetic order. The magnetic susceptibility shows a pronounced anisotropy below T N with an easy magnetic axis perpendicular to the crystallographic Ä‰axis. Total energy GGA+U calculations indicate a ground state with magnetic moments localized at the Gd ions and allowed a determination of the GdGd magnetic interactions. Band structure calculations of the electron and phonon contributions to the specific heat together with Quantum Monte Carlo calculations of the magnetic contributions show a very good agreement with the experimental data. Comparison between experiment and calculations suggests a significant anharmonic contribution to the specific heat at high temperature (View the MathML sourceTâ‰³100K).

Braghta, A., G. Schmerber, A. Derory, J. G. Sereni, and J. P. Kappler. "Magnetic and thermal properties of Ce2Pd2Sn." Journal of Magnetism and Magnetic Materials 320, no. 6 (2008): 1141–1145.
Abstract: Xray diffraction, susceptibility and specific heat studies on ternary Ce2Pd2Sn intermetallic compound and on its isostructural nonmagnetic compound La2Pd2Sn are reported. On Ce2Pd2Sn in absence of magnetic field, we confirm the existence of two magnetic transitions at TN = 4.8K (antiferromagnetic transition) and TC = 2.2K (ferromagnetic transition) and the specific heat results, measured down to 0.5 K, allow to recognize the transition at 2.2K as a firstorder transition. A description based on molecular field calculations for the S = 1/2 resonant level model leads to a characteristic Kondo TK of about 3K. (C) 2007 Elsevier B.V. All rights reserved.

Kappler, J. P., G. Schmerber, and J. G. Sereni. "Magnetic and thermal properties of Ce5Rh3." Journal of Magnetism and Magnetic Materials 115, no. 23 (1992): 241–244.
Abstract: Magnetic susceptibility, high field magnetization and specific heat measurements on Ce5Rh3 are reported. Two antiferromagnetic transitions are observed at T(N)=4.5 K and T(N)'=2.6 K. The magnetization curve at 1.5 K reveals a nontrivial magnetic structure in this compound, with a saturation magnetization of 0.72mu(B). The high temperature Curie constant (0.64 emu K/mol), the CurieWeiss constant (THETA(p)=45 K) and the entropy related with the magnetic transitions (DELTAS(m)=0.8 R In 2) indicate the presence of a Kondotype component in the ground state of Ce5Rh3.

Sereni, J. G., and J. P. Kappler. "Magnetic and thermal properties of CeCu." Journal of Magnetism and Magnetic Materials 109, no. 23 (1992): 349–352.
Abstract: Magnetic susceptibility, high field magnetization and specific heat measurements on CeCu are presented. An antiferromagnetic transition is observed at T(N) = 313 K, with some evidences of low dimensionality of the order parameter. The saturation magnetization. M(s) = 1.16mu(B), implies that the crystalline electric field (CEF) ground state doublet is strongly magnetic, in agreement with the low temperature Curie constant C = 0.46 emu K/mol. In the high temperature limit (T > 50 K), the obtained Curie constant is C = 0.65 emu K/mol, which suggests an overall CEF splitting larger than 200 K. The entropy gain at the magnetic transition is 72% of the expected R in 2. The missing entropy is related to a specific heat anomaly with a maximum at approximately 13 K, which is attributed to magnetic fluctuations in the Ce chains. The transition temperature and the high temperature broad maximum in the specific heat are weakly affected by an applied magnetic field of 1 T.

Vildosola, V. L., A. M. Llois, M. Weissmann, and J. G. Sereni. "Magnetic behaviour of Ce(Pd1xMx) compounds (M = Rh, Ni and Ag) within the LDA approximation." Journal of Magnetism and Magnetic Materials 236, no. 12 (2001): 6–8.
Abstract: Ce intermetallic compounds have been intensively studied in the last few decades due to the large variety of behaviours they exhibit. In particular, two ways of demagnetizing Ce have been experimentally tried within the ferromagnetic systems Ce(Pd1xMx), namely through electronic concentration variations (M=Rh) and volume reductions (M=Ni). On the other hand, when Pd is substituted by Ag, a transformation from a ferromagnetic to an antiferromagnetic ground state has been observed. In this work, we analyse the evolution of the magnetism of Ce in the abovementioned family of compounds by calculating the spin contribution to magnetism that results from spin polarised LDA calculations. (C) 2001 Elsevier Science B.V. All rights reserved.
