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- W2743507757 abstract "We have carried out a systematic study of the crystal electric field excitations in the family of cubic pyrochlores ${mathrm{Er}}_{2}{B}_{2}{mathrm{O}}_{7}$ with $B=mathrm{Ge}$, Ti, Pt, and Sn, using neutron spectroscopy. All members of this family are magnetic insulators based on $4{f}^{11}phantom{rule{0.28em}{0ex}}{mathrm{Er}}^{3+}$ and nonmagnetic ${B}^{4+}$. At sufficiently low temperatures, long-range antiferromagnetic order is observed in each of these ${mathrm{Er}}_{2}{B}_{2}{mathrm{O}}_{7}$ pyrochlores. The different ionic sizes associated with different nonmagnetic ${B}^{4+}$ cations correspond to positive or negative chemical pressure, depending on the relative contraction or expansion of the crystal lattice, which gives rise to different local environments at the ${mathrm{Er}}^{3+}$ site. Our results show that the $g$-tensor components are $XY$-like for all four members of the ${mathrm{Er}}_{2}{B}_{2}{mathrm{O}}_{7}$ series. However, the $XY$ anisotropy is much stronger for ${mathrm{Er}}_{2}{mathrm{Pt}}_{2}{mathrm{O}}_{7}$ and ${mathrm{Er}}_{2}{mathrm{Sn}}_{2}{mathrm{O}}_{7}phantom{rule{0.28em}{0ex}}({g}_{ensuremath{perp}}/{g}_{z}>25)$ than for ${mathrm{Er}}_{2}{mathrm{Ge}}_{2}{mathrm{O}}_{7}$ and ${mathrm{Er}}_{2}{mathrm{Ti}}_{2}{mathrm{O}}_{7}phantom{rule{0.28em}{0ex}}({g}_{ensuremath{perp}}/{g}_{z}<4)$. The variation in the nature of the $XY$ anisotropy in these systems correlates strongly with their ground states as ${mathrm{Er}}_{2}{mathrm{Ge}}_{2}{mathrm{O}}_{7}$ and ${mathrm{Er}}_{2}{mathrm{Ti}}_{2}{mathrm{O}}_{7}$ order into ${mathrm{ensuremath{Gamma}}}_{5}$ magnetic structures, whereas ${mathrm{Er}}_{2}{mathrm{Pt}}_{2}{mathrm{O}}_{7}$ and ${mathrm{Er}}_{2}{mathrm{Sn}}_{2}{mathrm{O}}_{7}$ order in the ${mathrm{ensuremath{Gamma}}}_{7}$ Palmer-Chalker structure." @default.
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- W2743507757 date "2018-01-17" @default.
- W2743507757 modified "2023-10-10" @default.
- W2743507757 title "Effect of chemical pressure on the crystal electric field states of erbium pyrochlore magnets" @default.
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- W2743507757 doi "https://doi.org/10.1103/physrevb.97.024415" @default.
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