Single-crystal growth and magnetic properties of the metallic molybdate pyrochlore Sm2Mo2O7

We have successfully grown cm3-size single crystals of the metallic-ferromagnet Sm2Mo2O7 by the floating-zone method using an infrared-red image furnace. The growth difficulties and the remedies found using a 2-mirror image furnace are discussed. Magnetization studies along the three crystalline axes of the compound are presented and discussed based on our recent proposal of an ordered spin-ice ground state for this compoun

Étude structurale et magnétique de molybdates d'éléments de transition

Structural and magnetic properties of M2Mo3O 8 compounds, where M = Mn, Fe, Co, or 1/2(FexZn 2-x), have been studied by neutron diffraction, susceptibility and magnetization measurements. All these compounds are isostructural with Zn2Mo3O8, antiferromagnetic for M = Fe, Co, and ferrimagnetic for M = Mn, 1/2(FeZn). For M = 1/2(FexZn 2-x), the compounds, ferrimagnetic in the zinc-rich region, become antiferromagnetic for x = 1.85. In the molecular field approximation, one can obtain the values of exchange terms between iron sublattices.Les molybdates M2Mo3O8, où M = Mn, Fe, Co, 1/2(FexZn2- x) ont été étudiés du point de vue structural et magnétique par diffraction de neutrons, mesures de susceptibilité et d'aimantation. Tous sont isotypes de Zn2Mo 3O8. Les composés M = Fe, Co sont antiferromagnétiques, les composés M = Mn, 1/2(FeZn) ferrimagnétiques. La configuration magnétique des composés M = 1/2(FexZn2-x), ferrimagnétique pour les composés riches en zinc, devient antiferromagnétique pour x = 1,85. Dans le cadre d'une théorie de champ moléculaire, on peut évaluer les différents termes d'échange entre sous-réseaux de fer