Wednesday, May 16, 2012

1205.3242 (N. V. Baranov et al.)

Field-induced high coercive ferromagnetic state and magnetoresistance in
the antiferromagnetically ordered compound Fe0.5TiS2
   [PDF]

N. V. Baranov, E. M. Sherokalova, A. S. Volegov, A. V. Proshkin, N. V. Selezneva, E. P. Proskurina
The measurements of the magnetic susceptibility, magnetization, electrical resistivity and magnetoresistance have been performed for the Fe intercalated compound Fe0.5TiS2. According to X-ray diffraction measurements the Fe0.5TiS2 compound synthesized in the present work has a monoclinic crystal structure (space group I12/m1) which results from the ordering of Fe ions and vacancies between S-Ti-S tri-layres. The changes in the heat-treatment conditions at temperatures below 1100 Celsius degrees do not lead to an order-disorder transition within the subsystem of intercalated Fe ions. It has been shown that this compound exhibits an antiferromagnetic (AF) ground state below the Neel temperature TN = 140 K. Application of the magnetic field at T < TN induces a metamagnetic phase transition to the ferromagnetic (F) state, which is accompanied by the large magnetoresistance effect (up to 27 %). The field-induced AF-F transition is found to be irreversible below ~ 100 K. The magnetization reversal in the metastable F state at low temperatures is accompanied by substantial hysteresis (~ 100 kOe) which is associated with the Ising character of Fe ions.
View original: http://arxiv.org/abs/1205.3242

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