Pressure Dependent Magnetism in Magnetically Ordered Interlanthanide Chalcogenides
Abstract
Several new interlanthanide chalcogenide compounds, Ln'/Ln''/Q (Ln’=light and Ln''=heavy lanthanide, Q=S or Se) have been synthesized using a novel flux-growth technique, their complex structures determined, and their magnetic properties measured. The majority, with general formula Ln'Ln''Q3 are paramagnetic for T> 2K, with effective moments consistent with the magnetic Ln constituents. EuLn2Q4 (Ln=Tb - Lu), which crystallize in the CaFe2O4- type three-dimensional channel structure, are all antiferromagnetic with TN ∼ 3-5 K. The Ln constituent is geometrically frustrated and has secondary effects on the magnetic properties,which are dominated by the Eu-Eu superexchange coupling. The sharply defined Neel temperature increases with hydrostatic pressure to P∼ 7 kbar for all EuLn2Q4. (For example, for EuLu2Se4, dTN/dP = +0.03 K/kbar at low pressures.)
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2008
- Bibcode:
- 2008APS..MAR.K1055C