Two new magnetic cubic compounds: Pr3Pt23Si11 and Nd3Pt23Si11

Christine Opagiste (1) , Rose-Marie Galéra (1) , Elsa Lhotel (1) , Martin James Jackson (1) , Carley Paulsen (1)

1 NEEL - MagSup - Magnétisme et Supraconductivité

We have synthesized for the first time, two new compounds of the R3Pt23Si11 series with R = Pr and R = Nd. They both crystallize in the same face-centered cubic structure (Fm-3m space group) as the La, Ce and Yb compounds. The lattice parameters are 16.8634(3) Å and 16.8493(4) Å for Pr3Pt23Si11 and Nd3Pt23Si11, respectively. From magnetic and heat capacity measurements, we found that Nd3Pt23Si11 presents a magnetic transition at 1.6 K, while Pr3Pt23Si11 displays temperature-independent Van Vleck paramagnetism down to at least 450 mK. At higher temperatures (50 to 300 K), the inverse magnetic susceptibility follows the Curie-Weiss law in both compounds, with θP of the order of -14 K.

Mots clés: antiferromagnetism; ferromagnetism; Van Vleck magnetism; crystal structure; rare earth intermetallics; specific heat

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Christine Opagiste, Rose-Marie Galéra, Elsa Lhotel, Martin James Jackson, Carley Paulsen. Two new magnetic cubic compounds: Pr3Pt23Si11 and Nd3Pt23Si11. International Conference on Supercondivity and Magnetism : ICSM 2012, Apr 2012, Istanbul, Turkey. ⟨hal-00796468⟩