Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 5: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 1 (jointly with MA)
TT 5.1: Vortrag
Montag, 16. März 2015, 09:30–09:45, H 0110
Investigation into the Magnetic Properties of Pyrochlore-type Rare-Earth Hafnates — •Jung Hwan Chun, Reinhard K. Kremer, and Chengtian Lin — MPI for Solid State Research, Stuttgart, Germany
Cubic rare-earths transition metal pyrochlores with composition R2TM2O7 have attracted broad attention because of their unusual magnetic ground state properties related to geometrical frustration of the pyrochlores lattice. So far, the investigation focused mainly on 3d and 4d transition metal systems. The magnetic properties of rare-earths 5d TM pyrochlores are comparatively less well studied. Here we report on the single-crystal growth and the magnetic properties of some rare-earth hafnates (R =Nd, Gd, Dy; TM = Hf) of composition R2Hf2O7. Nd2Hf2O7 and Gd2Hf2O7 crystallize with the cubic pyrochlores structure whereas diverging reports on the structure of Dy2Hf2O7 are available in literature. Crystals of R2Hf2O7 have been grown and their structural and magnetic properties have been investigated. Our investigations confirm Nd2Hf2O7 and Gd2Hf2O7 to crystallize in the cubic pyrochlores structure. Antiferromagnetic ordering below ∼0.5 K has been observed by magnetic susceptibility and heat capacity measurements for both compounds.