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

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

2005-07-18

arxiv.org/abs/cond-mat/0507413v1

Phys. Rev. B 72, 020409(R) (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, accepted to PRB

Scientific paper

10.1103/PhysRevB.72.020409

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.

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