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Gomez Berisso, M.; Sereni, J.G.; Braghta, A.; Schmerber, G.; Chevalier, B.; Kappler, J.P. |
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Title |
Field suppression of the modulated phase of Ce2Pd2Sn |
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Journal Article |
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Year |
2009 |
Publication |
Physica B |
Abbreviated Journal |
Proceedings of the International Conference on Strongly Correlated Electron Systems |
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404 |
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19 |
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2930-2933 |
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Keywords |
Magnetic phases; Critical points; Ce2Pd2Sn; Ferromagnetism |
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Abstract |
Low temperature magnetic (M) and thermal (CP) properties of the intermetallic compound Ce2Pd2Sn have been investigated at zero and different magnetic fields. Two transitions were recognized at and , with latter nearly coinciding with the extrapolated Curie-Weiss temperature . The Curie factor evaluated from T>=TM, is [approximate]2μB. The positive value of θP, the triangular coordination of the magnetic (Ce) atoms and the weak effect of applied magnetic field, reveal that TM cannot be considered as a canonic antiferromagnetic transition like claimed in the literature. M(T) measurements under moderate magnetic fields () show TC(B) increasing while TM(B) is practically not affected. Both transition merge in a critical point at for , where the intermediate phase is suppressed. At , the cusp of a first order transition is observed in CP(T). According to the proposed ferromagnetic ground state, it is followed by a CP(T)[is proportional to]T3/2exp(-Eg/T) dependence, with a gap of anisotropy . |
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0921-4526 |
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BT @ pedrazp @ |
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562 |
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Author |
Sereni, J.G.; Schmerber, G.; Kappler, J.P. |
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Title |
Thermodynamic Behavior of Ce Compounds Close to a T->0 Critical Point |
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Journal Article |
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Year |
2013 |
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IEEE Transactions on Magnetics |
Abbreviated Journal |
IEEE Trans. Magn. |
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49 |
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8 |
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4647-4651 |
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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 |
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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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0018-9464 |
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BT @ pedrazp @ |
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664 |
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