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The frequency, temperature, and the dc and ac dependences of the magnetic susceptibility of the YbCoGaO_{4} and LuCoGaO_{4} single crystals are investigated. The YbCoGaO_{4} behaves like an Ising spin glass with a strong uniaxial anisotropy. In contrast LuCoGaO_{4} is Heisenberg-like spin glass. Dynamical scaling reveals a three dimensional phase transition near Tg and yields critical exponent values...
We used the irreversibilities between the field cooled and zero field cooled dc magnetization to determine the field and composition dependence of the spin-glass freezing temperature in CdCr_{2}Se_{4} : In (REE) and CdCr_{2-2x}In_{2x}Se_{4} (0.15 ≤ x ≤ 0.35) (SG) thin films. The H-T phase diagram of samples with REE has two instability lines: the Gabay-Toulouse-type (G-T) and the De Almeida-Thouless-type...
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