Structural Disorder and Properties of the Stuffed Pyrochlore Ho2TiO5

Abstract

We report a structural and thermodynamic study of the "stuffed spin ice" material Ho2TiO5 (i.e., Ho2(Ti1.33Ho0.67)O6.67), comparing samples synthesized through two different routes. Neutron powder diffraction and electron diffraction reveal that the previously reported defect fluorite phase has short-range pyrochlore ordering, in that there are domains in which the Ho and Ho/Ti sublattices are distinct. By contrast, a sample prepared through a floating zone method has long range ordering of these sublattices. Despite the differences in crystal structures, the two versions of Ho2TiO5 display similar magnetic susceptibilities. Field dependent magnetization and measured recovered entropies, however, show a difference between the two forms, suggesting that the magnetic properties of the stuffed pyrochlores depend on the local structure.

submitted to Phys. Rev. B

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• New physics in frustrated magnets: Spin ices, monopoles, etc
• LiYbSe2: Frustrated Magnetism in a New Pyrochlore Lattice
• Role of defects in determining the magnetic ground state of ytterbium titanate
• Magnetothermal study of Dy Stuffed Spin Ice: Dy2(DyxTi2-x)O7-x/2
• Modification of Spin Ice Physics in Ho${}_2$Ti${}_2$O${}_7$ Thin Films
• Influence of controlled disorder on the dipolar spin ice state of Ho-based pyrochlores