Stuffed Rare Earth Pyrochlore Solid Solutions

Abstract

Synthesis and crystal structures are described for the compounds Ln2(Ti2-xLnx)O7-x/2, where Ln = Tb, Dy, Ho, Er, Tm, Yb, Lu, and x ranges from 0 to 0.67. Rietveld refinements on X-ray powder diffraction data indicate that in Tb and Dy titanate pyrochlores, extra Ln3+ cations mix mainly on the Ti4+ site with little disorder on the original Ln3+ site. For the smaller rare earths (Ho-Lu), stuffing additional lanthanide ions results in a pyrochlore to defect fluorite transition, where the Ln3+ and Ti4+ ions become completely randomized at the maximum (x=0.67). In all of these Ln-Ti-O pyrochlores, the addition of magnetic Ln3+ in place of nonmagnetic Ti4+ adds edge sharing tetrahedral spin interactions to a normally corner sharing tetrahedral network of spins. The increase in spin connectivity in this family of solid solutions represents a new avenue for investigating geometrical magnetic frustration in the rare earth titanate pyrochlores.

25 pages, 7 figures, submitted to J. Solid State Chem

References in corpus (13)

• Spin Ice State in Frustrated Magnetic Pyrochlore Materials
• Spin Correlations in Ho${}_2$Ti${}_2$O${}_7$: a Dipolar Spin Ice System
• Magnetic and Thermodynamic Properties of the Collective Paramagnet-Spin Liquid Pyrochlore Tb2Ti2O7
• Low Temperature Spin Freezing in Dy2Ti2O7 Spin Ice
• Why spin ice obeys the ice rules
• Zero Point Entropy in Stuffed Spin Ice
• Neutron scattering studies of the spin ices Ho2Ti2O7 and Dy2Ti2O7 in applied magnetic field
• Superconductivity in Geometrically Frustrated Pyrochlore RbOs2O6
• Short-range Magnetic interactions in the Spin-Ice compound Ho${}_2$Ti${}_2$O${}_7$
• Quantum and thermal spin relaxation in diluted spin ice: Dy(2-x)MxTi2O7 (M = Lu, Y)
• Anisotropic Release of the Residual Zero-point Entropy in the Spin Ice Compound Dy2Ti2O7: Kagome-ice Behavior
• Dirty Spin Ice: The Effect of Dilution on Spin Freezing in Dy2Ti2O7
• Slow spin relaxation in a highly polarized cooperative paramagnet

Cited by in corpus (20)

• Magnetic Pyrochlore Oxides
• The Chemistry of Quantum Spin Liquids
• Lightly stuffed pyrochlore structure of single-crystalline Yb2Ti2O7 grown by the optical floating zone technique
• Magnetoelastic excitations in the pyrochlore spin liquid Tb${}_2$Ti${}_2$O${}_7$
• Impact of Stoichiometry of Yb2Ti2O7 on its Physical Properties
• Experimental Insights into Ground State Selection of Quantum XY Pyrochlores
• Neutron Spectroscopic Study of Crystalline Electric Field Excitations in Stochiometric and Lightly Stuffed Yb2Ti2O7
• Structural Disorder and Properties of the Stuffed Pyrochlore Ho2TiO5
• Structural disorder, magnetism, and electrical and thermoelectric properties of pyrochlore Nd2Ru2O7
• New physics in frustrated magnets: Spin ices, monopoles, etc
• Effect of Chemical Pressure on the Crystal Electric Field States of Erbium Pyrochlore Magnets
• RKKY oscillations in the spin relaxation rates of atomic scale nanomagnets
• Dilute stuffing in the pyrochlore iridate $E{u}_{2}I{r}_2{O}_7$
• Sample independence of magnetoelastic excitations in the rare earth pyrochlore Tb2Ti2O7
• Simulations of magnetic and magnetoelastic properties of Tb2Ti2O7 in paramagnetic phase
• Crystal Field and Magnetoelastic Interactions in Tb2Ti2O7
• 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
• Traversing the pyrochlore stability diagram; microwave-assisted synthesis and discovery of mixed B-site Ln${}_2$InSbO${}_7$ family
• Thin films of the spin ice compound Ho2Ti2O7