Diffraction of Dipolar-Octupolar (DO) Pyrochlores from hydrothermally-grown vectors

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Strongly Correlated Electrons

Diffraction of Dipolar-Octupolar (DO) Pyrochlores from hydrothermally-grown vectors

Dipolar spin ice regime proximate to an all-in-all-out Néel ground state in the dipolar-octupolar pyrochlore Ce$_2$Sn$_2$O$_7$

Representative (a) single crystal and (b) powder Ce

We present neutron diffraction measurements on newly synthesized hydrothermally-grown powders that show a broad signal at low scattering vectors, reminiscent of a dipolar spin ice.

To interpret the new diffuse scattering, we characterize the exchangeinteraction parameters in the near-neighbor xyz model associated with dipolar-octupolar (do) pyrochlores by fitting quantum numerical linked cluster expansions to heat capacity and magnetic susceptibility measurements, and classical monte carlo calculations to the diffuse neutron diffraction of the newlysynthesized samples.

Authors

D. R. Yahne, B. Placke, R. Schäfer, O. Benton, R. Moessner, M. Powell, J. W. Kolis, C. M. Pasco, A. F. May, M. D. Frontzek, E. M. Smith, B. D. Gaulin, S. Calder, K. A. Ross

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Introduction

Dipolar-octupolar pyrochlores, where different components transform as magnetic dipoles and octupoles, host a wealth of exotic phenomena due to their canonical frustrated geometry, range of interactions, single-ion anisotropies, and the ability to map to a simple pseudospin-1/2 system.

To advance our understanding of these multipolar systems, it is therefore imperative to develop a good microscopic description with respect to both the chemical properties of the samples under investigation and the appropriate model hamiltonian for their theoretical analysis.

We present detailed quantum numerical linked cluster expansion (nlce) calculations and monte-carlo simulations to directly fit the experimental susceptibility, heat capacity and neutron scattering data.

Result

Single crystal and powder samples of the pyrochlore stannate powder compound ce @xmath0 sn @xmath1 o @xmath2 were grown via a hydrothermal synthesis method.

Our single crystal and polycrystalline samples are bright yellow with a green tint, and we observe no evidence of oxidation effects over time while in air, in stark contrast to the sister compound which turns black on the order of hours.

Furthermore, we have collected temperature dependent, full-sphere single crystal x-ray data sets at @xmath3, @xmath4, and @xmath5 k. the oxygen atom positions were refined on lower symmetry sites and we see no flattening or movement of the thermal anisotropic displacement parameters, suggesting an absence of defects in the oxygen sublattice at any measurable concentration.

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CC BY

Source arXiv

Strongly Correlated Electrons

Diffraction of Dipolar-Octupolar (DO) Pyrochlores from hydrothermally-grown vectors

Dipolar spin ice regime proximate to an all-in-all-out Néel ground state in the dipolar-octupolar pyrochlore Ce$_2$Sn$_2$O$_7$

Representative (a) single crystal and (b) powder Ce

We present neutron diffraction measurements on newly synthesized hydrothermally-grown powders that show a broad signal at low scattering vectors, reminiscent of a dipolar spin ice.

Authors

D. R. Yahne, B. Placke, R. Schäfer, O. Benton, R. Moessner, M. Powell, J. W. Kolis, C. M. Pasco, A. F. May, M. D. Frontzek, E. M. Smith, B. D. Gaulin, S. Calder, K. A. Ross

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