NaSrMn2F7, NaCaFe2F7, and NaSrFe2F7: novel single crystal pyrochlore antiferromagnets.
作者： M B Sanders , J W Krizan , K W Plumb , T M McQueen , R J Cava
DOI: 10.1088/1361-648X/29/4/045801
关键词:
摘要: The crystal structures and magnetic properties of three previously unreported A2B2F7 pyrochlore materials, NaSrMn2F7, NaCaFe2F7, NaSrFe2F7 are presented. In these compounds, either S = 2Fe2+ or S = 5/2Mn2+ is on the B site, while nonmagnetic Na Ca (Na Sr) disordered A site. which were grown as crystals via floating zone method, display high effective moments large Curie-Weiss thetas. Despite characteristics, no ordering transition detected. However, freezing spins, characterized by peaks in susceptibility specific heat, observed at very low temperatures. empirical frustration index, f = -θ CW/T f, for materials 36 (NaSrMn2F7), 27 (NaSrFe2F7), 19 (NaCaFe2F7). AC susceptibility, DC heat capacity measurements used to characterize spin glass behavior. results suggest that compounds frustrated antiferromagnets with weak bond disorder. phenomena fluoride pyrochlores exhibit, addition their availability relatively single crystals, make them promising candidates study geometric frustration.
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