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Author Sereni, J.G.; Radu, T.; Pikul, A.
Title Analysis of the very low temperature phase diagrams of two Ce compounds Type Journal Article
Year 2008 Publication Journal of Optoelectronics and Advanced Materials Abbreviated Journal
Volume (up) 10 Issue 7 Pages 1645-1650
Keywords
Abstract 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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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1454-4164 ISBN Medium
Area Expedition Conference
Notes ISI:000257962300015 Approved no
Call Number BT @ hernan @ Serial 48
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Author Hartmann, S.; Deppe, M.; Oeschler, N.; Caroca-Canales, N.; Sereni, J.G.; Geibel, C.
Title Ferromagnetism in CePd1-xRhx single crystals Type Journal Article
Year 2008 Publication Journal of Optoelectronics and Advanced Materials Abbreviated Journal J. Optoelectr. Adv. Mater.
Volume (up) 10 Issue 7 Pages 1607-1611
Keywords Ce compound, ferromagnetism, heavy fermion system
Abstract The orthorhombic CePd1-xRhx alloy exhibits a continuous evolution from a ferromagnetic ground state at x = 0 to

intermediate-valence behavior for x = 1. Here, we report on specific heat CP(T), resistivity ρ(T) and magnetization M(T)

measurements on single crystals in a Rh concentration range 0.2 < x < 0.65 exploring the ferromagnetic side of the

magnetic phase diagram. The transport and thermodynamic properties of the ferromagnetic phase have been investigated

in the temperature range from 300 K down to 0.35 K and analyzed in terms of a gap in the magnon spectrum and an

underlying Kondo contribution. Crystal electric field parameters are deduced from specific heat measurements well above

Tc- The competition between Kondo effect and ferromagnetism has been studied in dependence of the Rh concentration in

the system. Particularly, the enhanced Sommerfeld coefficient γ(x) indicates strong Kondo interactions when the Curie

temperature is reduced.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number BT @ hernan @ Serial 308
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