Single-ion anisotropy in the gadolinium pyrochlores studied by an electron paramagnetic resonance
Glazkov, V. N. · Zhitomirsky, M. E. · Smirnov, A. I. · von Nidda, H. -A. Krug · Loidl, A. · Marin, C. · Sanchez, J. -P.
Original · EN
The electron paramagnetic resonance is used to measure the single-ion anisotropy of Gd3+ ions in the pyrochlore structure of (Y1-xGdx)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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