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Pikul, A.P.; Caroca-Canales, N.; Deppe, M.; Gegenwart, P.; Sereni, J.G.; Geibel, C.; Steglich, F. |
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Title |
Non-Fermi-liquid behaviour close to the disappearance of ferromagnetism in CePd1-xRhx |
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Journal Article |
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Year |
2006 |
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Journal of Physics: Condensed Matter |
Abbreviated Journal |
J. Phys.: Condens. Matter. |
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18 |
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42 |
Pages |
L535-L542 |
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Abstract |
The orthorhombic CePd1- xRhx system exhibits a continuous evolution from ferromagnetic order in CePd ( T-C = 6.6 K) to an intermediate-valence ground state in CeRh. Here we report low-temperature ( T >= 0.08 K) specific-heat measurements for concentrations 0.80 <= x <= 0.95 close to the disappearance of magnetic order (similar to 0.87). In contrast to x = 0.8, still demonstrating a smeared phase transition signature at 0.27 K, non-Fermi-liquid behaviour Delta C(T) / T alpha log T is observed in the electronic specific-heat coefficient at x = 0.85. For higher Rh concentrations a weak power-law dependence Delta C(T) / T alpha T-alpha with alpha approximate to 0.4 is found. Upon applying magnetic fields Fermi-liquid-like behaviour Delta C(T) / T similar to const is recovered in all the different samples. The magnetic entropy as well as the concentration of unscreened magnetic moments at 2 K indicate a broad distribution of local T-K values ranging from well below 2 K to far above 50 K. |
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0953-8984 |
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ISI:000241278000001 |
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BT @ hernan @ |
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54 |
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Author |
Sereni, J.G.; Radu, T.; Pikul, A. |
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Title |
Analysis of the very low temperature phase diagrams of two Ce compounds |
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Journal Article |
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Year |
2008 |
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Journal of Optoelectronics and Advanced Materials |
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10 |
Issue |
7 |
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1645-1650 |
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A rich variety of behaviours have been found studying the physical properties of Ce-lattice systems tuned around their critical regions, particularly in the few phase boundaries traced along more than a decade of temperature. The phase diagram of two Ce-systems: the antiferromagnetic CeIn3-xSnx and ferromagnetic CePd1-xRhx are analyzed covering the 10K > T > 0.02K range of temperature. Their respective magnetic phase diagrams are described as an interplay between different components determined after analyzing their thermodynamic properties. In the former compound, signs for the formation of a new phase are observed at very low temperature, whereas in the latter a field induced contribution is detected behind the critical point. |
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1454-4164 |
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ISI:000257962300015 |
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BT @ hernan @ |
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48 |
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