Observation of re-entrant spin glass behavior in (Ce1-xErx)Fe2 compounds
Magnetic Materials Laboratory, Department of Physics, Indian Institute of Technology Bombay Mumbai-400076, India
2 Tata Institute of Fundamental Research - Homi Bhabha Road, Mumbai-400005, India
Accepted: 6 September 2010
Experimental evidence of re-entrant spin glass (RSG) state has been revealed in Er-doped CeFe2 compounds. The zero-field–cooled - field-cooled bifurcation in dc magnetization, frequency dependence of freezing temperature, relaxation in zero-field–cooled magnetization and presence of large remanence have been discussed in detail. Frequency dependence is found to follow the critical slowing-down mechanism of the type: τ = τ0 (Tf/TSG−1)−zv. The RSG state is found to be associated with the randomly magnetized clusters instead of atomic level randomness.
PACS: 75.50.Lk – Spin glasses and other random magnets / 75.30.Kz – Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.) / 75.60.Nt – Magnetic annealing and temperature-hysteresis effects
© EPLA, 2010