Successive Spin Freezing Behavior in a Pyrochlore Antiferromagnet Y2Mo2O7under Magnetic Fields

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Abstract
Magnetic ordering of a geometrically frustrated pyrochlore antiferromagnet Y 2 Mo 2 O 7 has been investigated by AC and DC magnetic measurements. A spin freezing transition at ∼23 K is indicated by AC susceptibility and low-field DC magnetization data. Under magnetic field above 700 Oe, a two-step increase of the irreversible magnetization M irr (= M FC - M ZFC ) is observed, corresponding to the freezing of the transverse and longitudinal spin components. The field dependence of the freezing temperatures is consistent with the H - T relations of a Heisenberg mean field spin-glass. The coefficients of the H - T relations for the longitudinal freezing are, however, fairly large compared with those of conventional disordered spin-glasses studied so far.