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Ferromagnetism in CePdi1-xRhx single crystals

S. HARTMANN1,* , M. DEPPE1, N. OESCHLER1, N. CAROCA-CANALES1, J. SERENI2, C. GEIBEL1

Affiliation

  1. Max Planck Institute for Chemical Physics of Solids, Nothnitzer Str. 40, 01187 Dresden, Germany
  2. Atomico Bariloche (CNEA), 8400 S. C. de Bariloche, Argentina

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..

Keywords

Ce compound, Ferromagnetism, Heavy fermion system.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

S. HARTMANN, M. DEPPE, N. OESCHLER, N. CAROCA-CANALES, J. SERENI, C. GEIBEL, Ferromagnetism in CePdi1-xRhx single crystals, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1607-1611 (2008)