D. A. Velikanov

Simultaneous antiferromagnetic Fe3+ and Nd3+ ordering in NdFe3(11BO3)4

By means of magnetic susceptibility and specific heat measurements, x-ray and unpolarised neutron diffraction investigations on powder and single-crystal samples, simultaneous long-range antiferromagnetic Fe and Nd ordering in NdFe3(11BO3)4 with R 3 2 chemical structure has been found at temperatures below TN = 30.5(5) K down to 1.6 K. At temperatures down to 20 K to the propagation vector is khex = [0,0,3/2] and becomes slightly incommensurate at lower temperatures. Symmetry analysis yields magnetic spiral configurations with the magnetic moments oriented parallel to hexagonal basal plane according to the irreducible representations tau_3 in the commensurate case. This is in agreement with the easy directions of magnetisation perpendicular to the c-axis as determined by magnetic susceptibility measurements. At 1.6 K the magnetic Fe moment amounts to 4.9 muB close to the free ion moment of Fe3+. The magnetic Nd3+ moment saturates presumably due to crystal-field effects at 2.7 muB.

Magnetic structure, magnetic interactions and metamagnetism in terbium iron borate TbFe3(BO3)4: a?neutron diffraction and magnetization study

Magnetization, susceptibility and neutron scattering measurements were performed on the terbium iron borate TbFe3(BO3)4. Structural and magnetic phase transitions were obtained as a function of external magnetic field and temperature. A metamagnetic transition of the terbium spins and a spin-flop transition of the iron sublattice are obtained at an external magnetic field 35?kOe<Ht<60?kOe. The values of the effective exchange HE and the anisotropy HA fields are evaluated. Temperature dependent neutron diffraction studies reveal the magnetic structure of TbFe3(BO3)4 and the thermal evolution of the two magnetic sublattices. An antiferromagnetic coupling along the helicoidal chains of Fe atoms sets in at 40?K with a propagation vector . The magnetic ordering of the Tb sublattice sets in at the same temperature and leads to an anti-parallel alignment of the Fe and Tb moments within the a?b-planes with ?Fe = 4.4??B and ?Tb = 8.6??B at 2?K.

Magnetic, resonance, and electrical properties of single crystal and amorphous Bi2CuO4

Abstract Single crystal and amorphous samples Bi 2 CuO 4 were prepared. The magnetic susceptibility, magnetization, magnetic resonance and electrical resistivity measurements for wide range of temperatures and magnetic fields are presented. The anisotropic exchange interactions and 3-d antiferromagnetic behaviour were revealed for single crystal Bi 2 CuO 4 . The effective magnetic moments per copper ion were determined. The sharp differences between single crystal and amorphous samples properties were shown.

Conductivity, weak ferromagnetism, and charge instability in an α-MnS single crystal

The temperature dependence of resistivity, magnetization and electron-spin resonance of the

Synthesis and magnetic properties of copper metaborate single crystals, CuB2O4

\alpha- MnS

Crystal structure and magnetic anisotropy of ludwigite Co2FeO2BO3

single crystal were measured in temperature range of

Magnetism of Co layers in a Co/Si multilayer film

5 K < T < 550 K

Electron transition in intercalated disulfide CuCrS2

. Magnetization hysteresis in applied magnetic field up to 0.7 T at

Colossal magnetoresistance of FexMn1−xS magnetic semiconductors

T=5 K, 77 K, 300 K

Magnetic nanoparticles formed in glasses co-doped with iron and larger radius elements

, irreversible temperature behavior of magnetization and resistivity were found . The obtained data were explained in terms of degenerate tight binding model using random phase approximation. The contribution of holes in