Magnetization and electrical resistivity studies have established that ${\mathrm{La}}_{0.5}{\mathrm{Ba}}_{0.5}{\mathrm{CoO}}_{3\ensuremath{-}\ensuremath{\gamma}}$ (LaBaC) is a metallic ferromagnet whereas ${\mathrm{Pr}}_{0.5}{\mathrm{Ba}}_{0.5}{\mathrm{CoO}}_{3\ensuremath{-}\ensuremath{\gamma}}$ (PrBaC) magnetic semiconductor. The magnitudes of spontaneous magnetizations are in agreement with intermediate low-spin cobalt states itinerant $3d$ electrons....

The effect of treatment conditions on the magnetic and magnetotransport properties A-site ordered PrBaMn2O6−δ manganites is examined. parent oxygen-stoichiometric PrBaMn2O6 samples were prepared from disordered Pr0.50Ba0.50MnO3 ones by using a 'two-step' synthesis method. most significant structural feature that MnO2 sublattice sandwiched two kinds rock-salt layers, PrOx BaO. demonstrates ferromagnetic metal to paramagnetic insulator transition with Curie point at about 320 K. These...

Magnetization and specific heat of the $S=3∕2$ antiferromagnet on a kagome staircase, ${\mathrm{Co}}_{3}{\mathrm{V}}_{2}{\mathrm{O}}_{8}$, were investigated as function temperature magnetic field. The low magnetization data revealed unusual features related to strongly frustrated spin lattice. Of particular interest field induced phase transitions observed for various orientations Abrupt macroscopic jumps by directed along $\mathbit{c}$-axis have been below...

The magnetic properties of γ-Fe2O3 ferrimagnetic nanoparticles embedded in a multiblock poly(ether-ester) copolymer have been investigated by static magnetization and ferromagnetic resonance (FMR) measurements at two different dispersion states. Significant variation the response is identified below T≈120K, most pronounced marked field shift FMR spectra, independently state nanocomposites. This behavior correlates favorably with dynamic relaxation copolymer, indicating matrix freezing effect...

We report magnetization measurements in the Ln(Mn1−xCox)O3+λ (Ln=Eu, Nd; 0⩽x<1) and Y(Mn1−xCox)O3 (0.35⩽x⩽0.5) perovskites as a function of temperature magnetic field. Compositions range 0.35⩽x⩽0.8 (Ln=Eu), 0.4⩽x⩽0.6 (Ln=Nd), 0.35⩽x⩽0.45 (Ln=Y) exhibit metamagnetic behavior associated with transformation structure from ferrimagnetic, where moments Co2+ Mn4+ ions are antiparallel, to ferromagnetic they parallel. A state is observed for 0.1⩽x⩽0.15 (Ln=Nd) 0.45<x⩽0.5 compositions....

The temperature dependence of the magnetization single-crystal LiNiPO4 is measured for magnetic-field orientations along a, b, and c crystallographic axes. It found that value depends on magnetic prehistory sample. behavior antiferromagnetic sample explained by presence weak ferromagnetism in LiNiPO4. At a 5 K spontaneous moment axis around 0.005 G. When heated to 20.8 decreases monotonically zero. All susceptibility curves M(T)/H exhibit two features: jump kink at temperatures T1 T2,...

The nature of low- and high-temperature anomalies in electrical properties LaSr(Ca)MnO films with clusterized structure is investigated. Results concern the cluster sizes $D=100--150\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$, which charge quantization importance but quantum confinement does not yet have an appreciable effect on samples. samples are determined by spin-dependent tunneling. It shown that minima resistance versus temperature curves may be explained taking into account Coulomb...

The effect of light He-Ne $(\ensuremath{\lambda}=633$ nm) and Ar $(\ensuremath{\lambda}=488$ lasers on the magnetization epitaxial films manganite ${\mathrm{Pr}}_{0.6}{\mathrm{La}}_{0.1}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ was studied. It has been found that illumination stimulates antiferromagnetic-ferromagnetic phase transition observed in this a magnetic field at low temperature. In field, induces increase apparently is related to partial transformation an antiferromagnetic into...

The pressure effect on magnetic order and anisotropy of low-doped ${\mathrm{LaMnO}}_{3.05}$ single crystals with two competing ferromagnetic antiferromagnetic insulating phases was studied by magnetization measurements. It found that applied hydrostatic leads to an increase both Curie N\'eel temperatures, different rates: ${\mathrm{dT}}_{C}/dP=0.8\mathrm{K}/\mathrm{k}\mathrm{b}\mathrm{a}\mathrm{r}$ ${\mathrm{dT}}_{N}/dP=0.16\mathrm{K}/\mathrm{k}\mathrm{b}\mathrm{a}\mathrm{r}.$ External...

Magnetization studies have been carried out on a single crystal of TbBaCo2O5.5 in the temperature range 2–350 K and magnetic fields up to 50 kOe. Several spontaneous phase transitions observed analysed both Co (TC = 277 K, TN1 210 K) Tb (TN2 3.44 subsystems. It is shown that first-order transition at from an antiferromagnetic weak ferromagnetic state accompanied by intermediate state. The properties this are strongly determined thermo-magnetic history sample. Metamagnetic type 140 K< T<190...

Abstract Zero‐field susceptibility and specific heat of Pb[Cu(SO 4 )(OH) 2 ] (linarite) single crystal were measured. In order to verify that linarite is a quasi‐one‐dimensional system with competing nearest‐neighbour next‐nearest‐neighbour in‐chain exchange interaction ( J 1 ≈ –30 K, 15 K), theoretical results based on electronic structure calculations within the LDA phenomenological modelling using finite‐temperature transfer‐matrix method are taken into account. The possibility various...

The magnetic properties of γ -Fe 2 O 3 nanoparticles embedded in a thermoplastic elastomer poly(ether-ester) copolymer by the situ polycondensation reaction process have been investigated means magnetization and ferromagnetic resonance (FMR) measurements at low filler concentrations 0.1 0.3 wt% with additive introduced polymer matrix powder solution form. behavior magnetopolymeric nanocomposites indicates significant interparticle interaction effects that depend mainly on dispersion state as...

The influence of hydrostatic pressure on magnetization, electrical conductivity and magnetoresistance FeCr2S4 single crystals has been studied. Significant the temperature a spin-glass like magnetization anomaly, dTm/dp ≈ 2.7 K/kbar, Curie temperature, dTC/dp≈0.9 as well resistivity magnetoresistance, was found. negative maximum at is shifted under towards higher temperatures. Pressure induced changes low field anomalies Tm are correlated with in magnetization. In region appearance symmetry...

Magnetic properties of detwinned Tb0.9Dy0.1BaCo2O5.5 single crystals have been studied. The admixture Dy, introduced only for technological reasons, has no essential influence on the behaviour rare earth subsystem this compound, which is determined by electronic structure Tb3+ ions. It shown that Co3+ ions are Ising ions, with easy axis along a axis, in temperature range 2–276 K (TC). AFM phase (T<TN 2 = 3.4 K) strongly anisotropic, axes [101] and . magnetic field induced transitions...

Ferromagnetism is found in the CdGeAs2 chalcopyrite doped by Mn. The Curie point of these materials achieves 355 K. This highest AIIBIVCV2:Mn systems. These are heterogeneous magnets, they consist a ferromagnetic and superparamagnetic phases. Portion first phase increases with level doping. An origin ferromagnetism CdGeAs2:Mn connected existence vacancies (Cd, VC, Mn)GeAs2 or non-stoichiometric Ge, Mn)GeAs2, as only this case state more advantageous than spin glass-like on theoretical...

The diamagnetic susceptibility χ of aligned carbon nanotubes is anisotropic: χ|| differs from χ⊥. ratio χ||/χ⊥ exhibits a singularity at 40 K. Below this temperature in samples cooled magnetic field those zero field. This observation suggested interaction the moments responsible for susceptibility.