Macroscopic Anisotropy and Symmetry Breaking in the Pyrochlore Antiferromagnet Gd${}_2$Ti${}_2$O${}_7$}

Abstract

In the Heisenberg antiferromagnet $G{d}_{2}T{i}_2{O}_7$, the exchange interactions are geometrically frustrated by the pyrochlore lattice structure. This ESR study reveals a strong temperature dependent anisotropy with respect to a [111] body diagonal below a temperature $T_A=80$ K, despite the spin only nature of the $G{d}^{3+}$ ion. Anisotropy and symmetry breaking can nevertheless appear through the superexchange interaction. The presence of short range planar correlation restricted to specific Kagomé planes is sufficient to explain the two ESR modes studied in this work.

4 pages, 5 figures

References in corpus (4)

• Symmetry breaking due to Dzyaloshinsky-Moriya interactions in the kagome lattice
• Order in the Heisenberg Pyrochlore: The Magnetic Structure of Gd2Ti2O7
• Multiple Field-Induced Phase Transitions in a Geometrically-Frustrated Dipolar Magnet - Gd2Ti2O7
• Effective nuclear temperature in a fluctuating spin system

Cited by in corpus (7)

• Magnetic Pyrochlore Oxides
• Magnetic phase diagram of the antiferromagnetic pyrochlore Gd2Ti2O7
• Field-Driven Transitions in the Dipolar Pyrochlore Antiferromagnet Gd${}_2$Ti${}_2$O${}_7$
• Spin-liquid dynamics of pyrochlore magnets Gd2Ti2O7 and Gd2Sn2O7
• Degeneracy and Strong Fluctuation-Induced First-Order Phase Transition in the Dipolar Pyrochlore Antiferromagnet
• Magnetic resonance in a pyrochlore antiferromagnet Gd2Ti2O7
• Low-temperature heat transport of the geometrically frustrated antiferromagnets R_2Ti_2O_7 (R = Gd and Er)