REENTRANT SPIN-GLASS-LIKE BEHAVIOR OF (FE0.90CR0.05NI0.05)2P

• Di-iron phosphide with small substitutions of iron with Cr and Ni, (Fe0.90Cr0.05Ni0.05)2P, has been investigated by SQUID-magnetometry. The sample exhibits a first order ferromagnetic transition at T(c) almost-equal-to 180 K and a re-entrant spin glass transition at T(g) almost-equal-to 125 K. The ferromagnetic transition is severely smeared by weak applied magnetic fields. The re-entrant transition is evidenced from both dc-magnetisation and ac-susceptibility measurements. An aging phenomenon is observed at temperatures below T(g) and the freezing temperatures, T(f), and their corresponding relaxation times, tau scale according to conventional critical slowing down: tau/tau0 = ((T(f) - T(g))/T(g))-znu, with an exponent znu almost-equal-to 9, a value that is found also at ordinary paramagnetic to spin glass transitions.

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NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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