Spin-glass dynamics ofLa0.95Sr0.05CoO3

Spray drying: An alternative synthesis method for polycationic oxide compounds

“…Indeed in the La 1-x Sr x CoO 3 and La 1-x Ba x CoO 3 systems with x below ~0.20, the magnetic behavior is known to be dominated by a frustration state (spin-glass phase), due to the opposition between antiferromagnetic superexchange (Co 3+ -Co 3+ and Co 4+ -Co 4+ interactions) and ferromagnetic double exchange (Co 3+ -Co 4+ interactions) [30,[37][38][39]. In the present work, our sample prepared from a spray-dried precursor displays properties similar to the sample of Nam et al [36] but with a much shorter heat treatment (40 h).…”

“…5) obtained here forthe spray-dried sample (T cusp~2 0 K) agree well with the behavior reported by Nam et al [36], whereas other authors [29,37,38] found an irreversibility temperature of ~200 K. The main difference between these literature reports is the duration of the heat treatment: the sample of Nam et al [36] was prepared by solidstate reaction using a 2-month heat treatment. These authors stressed the importance of a homogeneous distribution of strontium cations to prevent any ferromagnetic cluster effects [36]. Indeed in the La 1-x Sr x CoO 3 and La 1-x Ba x CoO 3 systems with x below ~0.20, the magnetic behavior is known to be dominated by a frustration state (spin-glass phase), due to the opposition between antiferromagnetic superexchange (Co 3+ -Co 3+ and Co 4+ -Co 4+ interactions) and ferromagnetic double exchange (Co 3+ -Co 4+ interactions) [30,[37][38][39].…”

“…The results of magnetic susceptibility (see Fig. 5) obtained here forthe spray-dried sample (T cusp~2 0 K) agree well with the behavior reported by Nam et al [36], whereas other authors [29,37,38] found an irreversibility temperature of ~200 K. The main difference between these literature reports is the duration of the heat treatment: the sample of Nam et al [36] was prepared by solidstate reaction using a 2-month heat treatment. These authors stressed the importance of a homogeneous distribution of strontium cations to prevent any ferromagnetic cluster effects [36].…”

Evolution of the spin-state transition with doping in La1−xSrxCoO3Smith1, Hoch2, Moulton3 et al. 2012Phys. Rev. B283200View full textAdd to dashboardCite

“…At the critical doping of x C =0.17, the system simultaneously undergoes a percolative insulatorto-metal transition (IMT) and ferromagnetic (FM) order transition. The IMT results from the overlapping of metallic spin-clusters that emerge from the close proximity of multiple randomly doped Sr ions 2,3 .…”

Metastable magnetic behavior in La0.9Tb0.1MnO3

“…This kind of materials exhibits a wide range of complex magnetic structures, such as antiferromagnetism (AFM), ferromagnetism (FM), spin glass and superparamagnetism. There are very few studies on the dynamic behavior although some results of glassy and relaxation magnetic behaviors were reported [8][9][10][11].…”