title: Magnetic order, field-induced phase transitions and magnetoresistance in the intercalated compound Fe0.5TiS2.
abstract: Measurements of the magnetic susceptibility, magnetization, electrical resistivity and neutron diffraction have been performed for the compound Fe(0.5)TiS(2) in which Fe atoms are intercalated between S-Ti-S tri-layers. It has been shown that this compound with a monoclinic crystal structure exhibits an antiferromagnetic (AF) ground state below the Néel temperature T(N) ≈ 140 K. Small deviations from the stoichiometry and some disordering effects caused by the additional low-temperature heat treatment do not affect substantially the AF state in Fe(0.5)TiS(2). According to neutron diffraction data the magnetic structure at 2 K is described by the propagation vector k = (1/4,0,1/4). The Fe magnetic moments with a value of (2.9 ± 0.1) μ(B) are directed at an angle of (78.5 ± 1.8)° to the layers. Application of the magnetic field at T < T(N) induces a metamagnetic phase transition to the ferromagnetic (F) state, which is accompanied by the large magnetoresistance effect (|Δρ/ρ| up to 27%). Below 100 K, the field-induced AF-F transition is found to be irreversible, as evidenced by magnetoresistance and neutron diffraction measurements. The magnetization reversal in the metastable F state is accompanied at low temperatures by substantial hysteresis (ΔH ~ 100 kOe) which is associated with the Ising character of Fe ions.
authors.affiliation: Institute of Metal Physics, Russian Academy of Science, Ekaterinburg, Russia.
authors.forename: N V
authors.initials: NV
authors.lastname: Baranov
authors.forename: E M
authors.initials: EM
authors.lastname: Sherokalova
authors.forename: N V
authors.initials: NV
authors.lastname: Selezneva
authors.forename: A V
authors.initials: AV
authors.lastname: Proshkin
authors.forename: A F
authors.initials: AF
authors.lastname: Gubkin
authors.forename: L
authors.initials: L
authors.lastname: Keller
authors.forename: A S
authors.initials: AS
authors.lastname: Volegov
authors.forename: E P
authors.initials: EP
authors.lastname: Proskurina
mesh_terms: D018360:Crystallography, X-Ray; D007364:Intercalating Agents / Q000737:chemistry*; D060526:Magnetic Fields; D059346:Magnets / Q000737:chemistry*; D008958:Models, Molecular; D033363:Neutron Diffraction; D044367:Phase Transition; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D007364:Intercalating Agents; C061975:titanium sulfide; D014025:Titanium