Single-ion anisotropy in the gadolinium pyrochlores studied by an electron paramagnetic resonance

Abstract

The electron paramagnetic resonance is used to measure the single-ion anisotropy of Gd3+ ions in the pyrochlore structure of (Y{1-x}Gdx)2Ti2O7. A rather strong easy-plane type anisotropy is found. The anisotropy constant D is comparable to the exchange integral J in the prototype Gd2Ti2O7, D~0.75J and exceeds the dipolar energy scale. Physical implications of an easy-plane anisotropy for a pyrochlore antiferromagnet are considered. We calculate the magnetization curves at T=0 and discuss phase transitions in magnetic field.

arXiv comment5 pages, accepted to PRB

References in corpus (8)

• Low-temperature properties of classical, geometrically frustrated antiferromagnets
• Transition to Long Range Magnetic Order in the Highly Frustrated Insulating Pyrochlore Antiferromagnet Gd_2Ti_2O_7
• Order induced by dipolar interactions in a geometrically frustrated antiferromagnet
• Field induced ordering in highly frustrated antiferromagnets
• Multiple Field-Induced Phase Transitions in a Geometrically-Frustrated Dipolar Magnet - Gd2Ti2O7
• Magnetic phase diagram of the antiferromagnetic pyrochlore Gd2Ti2O7
• Soft modes in the easy plane pyrochlore antiferromagnet
• Field-Driven Transitions in the Dipolar Pyrochlore Antiferromagnet Gd${}_2$Ti${}_2$O${}_7$

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