Abstract
We have measured the magnetic field and temperature dependence of the nonlinear dc susceptibility, χnl, of the frustrated pyrochlore antiferromagnet Y2Mo2O7 close to and above the temperature, Tg∼22 K, where this material exhibits irreversible (spin-glass like) magnetic behavior. Our results suggest that the observed irreversible magnetic properties in this material are due to a thermodynamic spin-glass transition signaled by a divergence of the nonlinear magnetic susceptibility coefficient χ3∼(T/Tg−1)−γ at Tg with γ=3.3±0.5. χnl shows two power-law behavior at Tg, χnl∼H2/δ, with δ∼2.8 for H<1000 Oe and δ∼4.1 for H≳2000 Oe. These values for γ and δ, as well as the crossover behavior of χnl at Tg, is consistent what is found in common disordered Heisenberg spin glass materials.
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