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Hartmann, S.; Deppe, M.; Oeschler, N.; Caroca-Canales, N.; Sereni, J.G.; Geibel, C. |
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Title |
Ferromagnetism in CePd1-xRhx single crystals |
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2008 |
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Journal of Optoelectronics and Advanced Materials |
Abbreviated Journal |
J. Optoelectr. Adv. Mater. |
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10 |
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7 |
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1607-1611 |
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Keywords |
Ce compound, ferromagnetism, heavy fermion system |
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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 Ï(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. |
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BT @ hernan @ |
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308 |
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Sereni, J.G.; Caroca-Canales, N.; Kumar, M.; Oeschler, N.; Gómez Berisso, M.; Geibel, C. |
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Title |
CeRuGe and CeRuSi: Heavy fermion systems with some unusual features |
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Journal Article |
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Year |
2010 |
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Journal of Physics: Conference Series |
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200 |
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1 |
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012181 |
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We have investigated the physical properties of CeRuSi, its homologue CeRuGe and some doped La alloys. All of them present similar properties: large paramagnetic temperatures θp ##IMG## [http://ej.iop.org/icons/Entities/approx.gif] {approx} −100 K and the level off of χ( T ) below ##IMG## [http://ej.iop.org/icons/Entities/approx.gif] {approx} 10 K in coincidence with the maximum decrease of p ( T ), which starts to drop below 25 K. The respective γ ( CeRuSi ) ##IMG## [http://ej.iop.org/icons/Entities/approxeq.gif] {approxeq} 0.18 and γ ( CeRuGe ) ##IMG## [http://ej.iop.org/icons/Entities/approxeq.gif] {approxeq} 0.15 J/molK 2 coefficients reveal a heavy fermion character, with a Kondo temperature T K ##IMG## [http://ej.iop.org/icons/Entities/approxeq.gif] {approxeq} 50 K comparable to the crystal field splitting. In both compounds a broad maximum in C P ( T )/ T is observed around 5 K, whose origin is yet not clear. In contrast to the usual behavior observed in Kondo lattice systems, when Si is replaced by Ge T K ##IMG## [http://ej.iop.org/icons/Entities/propto.gif] {propto} θ p and 1/γ practically does not decreases despite the unit cell volume of CeRuGe is about 3% larger than that of CeRuSi. We discuss possible origins for these unusual features. |
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1742-6596 |
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BT @ berisso @ |
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597 |
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