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Author Sereni, J.G.; Schmerber, G.; Kappler, J.P. doi  openurl
  Title Thermodynamic Behavior of Ce Compounds Close to a T->0 Critical Point Type Journal Article
  Year 2013 Publication (up) IEEE Transactions on Magnetics Abbreviated Journal IEEE Trans. Magn.  
  Volume 49 Issue 8 Pages 4647-4651  
  Keywords cerium compounds; critical points; entropy; palladium compounds; specific heat; CePd3Bx; CePd3Bex; cerium compounds; critical point; entropy; specific heat; thermodynamic behavior; Compounds; Entropy; Heating; Saturation magnetization; Temperature dependence; Temperature measurement; Thermodynamics; Cerium; magnetic properties; thermodynamics  
  Abstract There is a reduced group of Ce very heavy Fermions (VHF) which do not order magnetically down to at least T ≈ 500 mK because they are very close to a Tord = 0 critical point. These compounds are at the top of the limT→ 0 Cm/T specific heat values because they collect very high density of low energy excitations. From the analysis of Cm(T)/T and entropy Sm(T) dependencies performed on selected CePd3Mx ternaries (where M = B and Be) a quantitative evaluation of an upper limit for the density of excitations can be proposed. These observations exclude any evidence of Cm(T)/T divergency as T→ 0 in agreement with thermodynamic laws. A comparison with selected Yb-base VHF supports these features.  
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  ISSN 0018-9464 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 664  
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Author Kappler, J.P.; Lehmann, P.; Schmerber, G.; Nieva, G.; Sereni, J.G. doi  openurl
  Title Magnetic properties of the Ce-Rh binary phases Type Journal Article
  Year 1988 Publication (up) Journal de Physique Colloques Abbreviated Journal  
  Volume 49 Issue C8 Pages 721-722  
  Keywords  
  Abstract Crystallographic, magnetic and resistivity studies on the Ce-Rh binary phases clearly define two Ce ground state regions : i) CeRh3, CeRh2 and CeRh as intermediate valence compounds and ii) Ce5Rh4, Ce3Rh2 Ce5Rh3 and Ce7Rh3 with magnetic transitions at low temperature.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0302-0738 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:A1988U701200329 Approved no  
  Call Number BT @ hernan @ Serial 122  
Permanent link to this record
 
 
Author Braghta, A.; Schmerber, G.; Derory, A.; Sereni, J.G.; Kappler, J.P. doi  openurl
  Title Magnetic and thermal properties of Ce2Pd2Sn Type Journal Article
  Year 2008 Publication (up) Journal of Magnetism and Magnetic Materials Abbreviated Journal J. Magn. Magn. Mater.  
  Volume 320 Issue 6 Pages 1141-1145  
  Keywords  
  Abstract X-ray 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 T-N = 4.8K (antiferromagnetic transition) and T-C = 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 first-order transition. A description based on molecular field calculations for the S = 1/2 resonant level model leads to a characteristic Kondo T-K of about 3K. (C) 2007 Elsevier B.V. All rights reserved.  
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  Series Volume Series Issue Edition  
  ISSN 0304-8853 ISBN Medium  
  Area Expedition Conference  
  Notes ISI:000254416300060 Approved no  
  Call Number BT @ hernan @ Serial 49  
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Author TROVARELLI, O.; SERENI, J.G.; SCHMERBER, G.; KAPPLER, J.P. openurl 
  Title COEXISTENCE OF KONDO AND SPIN-GLASS BEHAVIOR IN CE4Y3NI3 Type Journal Article
  Year 1995 Publication (up) JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Abbreviated Journal  
  Volume 140 Issue Pages 1211-1212  
  Keywords  
  Abstract Magnetic susceptibility chi and specific heat C-p measurements on Ce4Y3Ni3 are presented. The temperature of the maximum of chi(ac)(T) and C-p(T) shifts with frequency and applied field respectively, as expected for a spin glass (SG) system. The C-p (T --> 0) dependence corresponds to that of an anisotropic SG. According to the entropy gain two Ce atoms are involved in the SG contribution and two exhibit Kondo effect.  
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  ISSN 0304-8853 ISBN Medium  
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  Notes ISI:A1995QM07400233 Approved no  
  Call Number BT @ hernan @ Serial 101  
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Author Kappler, J.P.; Schmerber, G.; Sereni, J.G. doi  openurl
  Title Magnetic and thermal properties of Ce5Rh3 Type Journal Article
  Year 1992 Publication (up) Journal of Magnetism and Magnetic Materials Abbreviated Journal J. Magn. Magn. Mater.  
  Volume 115 Issue 2-3 Pages 241-244  
  Keywords  
  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 Curie-Weiss 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 Kondo-type component in the ground state of Ce5Rh3.  
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  ISSN 0304-8853 ISBN Medium  
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  Notes ISI:A1992JV02200022 Approved no  
  Call Number BT @ hernan @ Serial 111  
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Author Sereni, J.G.; Trovarelli, O.; Schmerber, G.; Kappler, J.P. doi  openurl
  Title Coexistence of magnetic order and heavy fermion behavior in Ce7X3 Type Journal Article
  Year 1992 Publication (up) Journal of Magnetism and Magnetic Materials Abbreviated Journal J. Magn. Magn. Mater.  
  Volume 108 Issue 1-3 Pages 183-184  
  Keywords  
  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.  
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  ISSN 0304-8853 ISBN Medium  
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  Notes ISI:A1992HH32900075 Approved no  
  Call Number BT @ hernan @ Serial 113  
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Author KAPPLER, J.P.; SCHMERBER, G.; TROVARELLI, O.; SERENI, J.G. openurl 
  Title HEAVY FERMION AND INTERMEDIATE VALENCE BEHAVIOR IN CE24CO11 Type Journal Article
  Year 1992 Publication (up) JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Abbreviated Journal  
  Volume 108 Issue 1-3 Pages 185-186  
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  Abstract Low temperature specific heat and magnetic susceptibility measurements on Ce24Co11 are reported. The electronic specific heat can be decomposed into two contributions: a low temperature one (arising at T < 5 K), with a maximum of 2.2 J/K mol at 0.9 K, and another one becoming dominant at T > 5 K, characterized by a gamma(HT) = 1.8 J/K2 mol efficient. The (chi)T product changes continuously with temperature, from 0.48 emu K/mol at 2 K to 7.85 emu K/mol at 200 K. Reminding that 1 mol = 1f.u. contains 24 Ce atoms distributed in ten unequivalent crystalline sites, we interpret the experimental results as due to: one atom which behaves as a heavy fermion, and the rest as intermediate valents, with a distribution of characteristic energies governed by nine different environments. The specific heat behaviour under applied field confirms this interpretation.  
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  ISSN 0304-8853 ISBN Medium  
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  Notes ISI:A1992HH32900076 Approved no  
  Call Number BT @ hernan @ Serial 114  
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Author KAPPLER, J.P.; SCHMERBER, G.; SERENI, J.G. doi  openurl
  Title CERIUM MAGNETIC-BEHAVIOR IN CE(PD,M) WITH M = CO, NI, RH, IR, PT, CU, AG AND AU Type Journal Article
  Year 1988 Publication (up) Journal of Magnetism and Magnetic Materials Abbreviated Journal J. Magn. Magn. Mater.  
  Volume 76-7 Issue Pages 185-186  
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  ISSN 0304-8853 ISBN Medium  
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  Notes ISI:A1988T046300057 Approved no  
  Call Number BT @ hernan @ Serial 124  
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Author Sereni, J.G.; Nieva, G.L.; Schmerber, G.; Kappler, J.P. doi  openurl
  Title EVIDENCES FOR UNCONVENTIONAL SUPERCONDUCTIVITY IN RARE-EARTH INTERMETALLICS Type Journal Article
  Year 1989 Publication (up) Modern Physics Letters B Abbreviated Journal Mod. Phys. Lett. B  
  Volume 3 Issue 16 Pages 1225-1231  
  Keywords  
  Abstract The specific heat of CeRu2 and La5Rh4 of the superconducting state does not follow a BCS-exponential temperature dependence, but a T2 law. At very low temperature (T = 0.1 Tc), CeRu2 shows a linear T dependence, which corresponds to a constant density of states. The experimental results are well described by the theoretical predictions for an axial state (CeRu2) and polar state (La5Rh4) superconductors. The small Sommerfeld coefficient of La5Rh4(? = 3.4 mJ/K2 La at.) excludes this compound from the heavy fermion superconductors.  
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  Notes Approved no  
  Call Number BT @ gnieva @ Serial 428  
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Author Sereni, J.G.; Trovarelli, O.; Schaf, J.; Schmerber, G.; Kappler, J.P. doi  openurl
  Title Extremely Low Density of States in CePd7 Type Journal Article
  Year 1991 Publication (up) Modern Physics Letters B Abbreviated Journal Mod. Phys. Lett. B  
  Volume 5 Issue 18 Pages 1249-1253  
  Keywords  
  Abstract The low temperature specific heat and magnetic susceptibility measurements, up to room temperature, on CePd7 are reported. The Sommefeld coefficient gamma and the Pauli susceptibility chio were found to have the lowest values within the Ce compounds: gamma = 9.8 mJ/mole K2 and chio = 0.14 × 10-3 emu/mole. The ratio chio/gamma = 0.014 emu K2/J is that of a free electron, instead of an intermediate valence system (0.036 emu K2/J). Such a value suggests complete delocalization of the Ce 4f electrons.  
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  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 684  
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