Spin-Glass Transition in the RCoGaO4 (R=Lu, Yb) Layered Cobaltites

I. Radelytskyia, R. Szymczaka, H.A. Dabkowskab, H.M.L. Noadb, P. Aleshkevycha and H. Szymczaka a Institute of Physics PAS, al. Lotnikow 32/46, 02 668 Warszawa, Poland b Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada

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The frequency, temperature, and the dc and ac dependences of the magnetic susceptibility of the YbCoGaO4 and LuCoGaO4 single crystals are investigated. The YbCoGaO4 behaves like an Ising spin glass with a strong uniaxial anisotropy. In contrast LuCoGaO4 is Heisenberg-like spin glass. Dynamical scaling reveals a three dimensional phase transition near Tg and yields critical exponent values between those of Heisenberg- and Ising-like systems.

DOI: 10.12693/APhysPolA.126.230 PACS numbers: 75.30.Cr, 75.30.Gw, 75.30.Kz, 75.40.-s, 75.50.Lk,