Spin Reorientations in (ErxY1-x)2Fe14B and (ErxPr1-x)2Fe14B Systems

1987 ◽  
Vol 96 ◽  
Author(s):  
E. B. Boltich ◽  
A. T. Pedziwiatr ◽  
W. E. Wallace
Keyword(s):  
Magnetic Properties ◽  
Crystal Field ◽  
Field Model ◽  
Magnetic Behavior ◽  
Theoretical Description ◽  
Adjustable Parameter ◽  
Spin Reorientation ◽  
Exchange Field ◽  
Field Problem ◽  
Curie Temperatures

ABSTRACTThe bulk magnetic properties of (ErxY1-x)2Fe14B and (ErxPr1-x)2Fe14B systems were studied over the temperature range 4.2-1100 K. Lattice parameters, saturation magnetizations, Curie temperatures and spin reorientation temperatures were determined. Theoretical description of the detailed magnetic behavior is presented, based on a crystal field model. The (ErxY1-x)2Fe14B compounds were all found to exhibit plane-to-axis spin reorientations similar to that observed for Er2Fe14B, with the transition temperature decreasing with increasing Y content. In contrast, the spin reorientations in the (ErxPr1-x)2Fe14B systems appear to be of the cone-to-axis type. Since higher order crystal field terms appear to be significant only in the cases of Nd3+ and Ho3+, the results are discussed in terms of a crystal field Hamiltonian involving only 2nd order terms. Using known values of the exchange field, Fe anisotropy and the ratios of the crystal field coefficients, the multi-ion cr 6.tal field problem was formulated in terms of a single adjustable parameter (B02(f). It is shown that 2nd order crystal field terms are capable, not only of explaining the conical anisotropy of the (ErxPr1-x)2Fe14B systems, but also the decrease in the Er moment upon passing through the spin reorientation (as has been observed for Er2Fe14B). The magnetic structure of Er1.5Pr0.5Fe14B is also predicted.

THE COMBINED ANALYSIS OF SPECIFIC HEAT AND THERMAL EXPANSION OF Nd1−xLuxMn2 COMPOUNDS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 810-813
Author(s):  
N.H. KIM-NGAN ◽  
P.E. BROMMER ◽  
J.J.M. FRANSE
Keyword(s):  
Magnetic Properties ◽  
Thermal Expansion ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Crystal Field ◽  
Spin Fluctuation ◽  
Spin Reorientation ◽  
Antiferromagnetic Order ◽  
Combined Analysis ◽  
Temperature Range

Specific heat and thermal expansion measurements have been performed on Nd1−xLUxMn2 in the temperature range between 1.5K and 300K. Below 10K, anomalies are observed which are ascribed to a spin reorientation of the Nd sublattice. These anomalies are only slightly affected by the substitution of Nd by Lu. Large effects, however, are observed on the magnetic properties of the Mn sublattice. The antiferromagnetic order disappears for x exceeding 0.30. The data are analysed in terms of Grüneisen parameters. In the paramagnetic compound LuMn2, a spin-fluctuation contribution to the thermodynamic properties is observed. In the Nd-containing compounds, distinct contributions from the crystal field acting on the Nd ions can be distinguished. The variation of the magnetic properties of the Mn sublattice with the concentration of Lu is discussed.

Comment on “Crystal Field Model of the Magnetic Properties of URu2Si2”

1995 ◽  
Vol 74 (20) ◽  
pp. 4097-4097 ◽  
Author(s):  
M. B. Walker ◽  
W. J. L. Buyers
Keyword(s):  
Magnetic Properties ◽  
Crystal Field ◽  
Field Model

THE MAGNETIC BEHAVIOR OF (Y1-xTbx)3Co11B4 INTERMETALLIC COMPOUNDS

1999 ◽  
Vol 13 (25) ◽  
pp. 905-910
Author(s):  
R. TETEAN ◽  
V. POP ◽  
E. BURZO ◽  
I. GR. DEAC
Keyword(s):  
Magnetic Properties ◽  
Intermetallic Compounds ◽  
Exchange Interactions ◽  
Magnetic Behavior ◽  
Hexagonal Structure ◽  
External Fields ◽  
Space Group ◽  
Temperature Range ◽  
Ferrimagnetic Ordering ◽  
Curie Temperatures

The R 3 Co 11 B 4 compounds belong to the R n+1 Co 3n+5 B 2n intermetallic systems. The R 3 Co 11 B 4 borides crystallize in a hexagonal structure of Ce 3 Co 11 B 4 type having the space group P6/mmm. The composition dependencies of the lattice parameters in ( Y 1-x Tb x)3 Co 11 B 4 compounds are linear and different for a and c parameters. The magnetic properties of ( Y 1-x Tb x)3 Co 11 B 4 compounds were investigated in the temperature range 4.2–950 K and external fields up to 10 T. The Y 3 Co 11 B 4 compound is ferromagnetically ordered. For the compounds with x>0, a ferrimagnetic ordering is evidenced. The Curie temperatures increase when yttrium is substituted by terbium, as a consequence of the increase of the exchange interactions in the system. The magnetic behavior of cobalt in the above system is analyzed.

Magnetic properties and the crystal field problem for tetragonal HoBa2Cu3Ox

2006 ◽  
Vol 18 (46) ◽  
pp. 10445-10455 ◽  
Author(s):  
Z A Kazei ◽  
G Fillion ◽  
A Harat ◽  
V V Snegirev ◽  
L P Kozeeva
Keyword(s):  
Magnetic Properties ◽  
Crystal Field ◽  
Field Problem

scholarly journals Магнитные и магнитодиэлектрические свойства Ho-=SUB=-0.5-=/SUB=-Nd-=SUB=-0.5-=/SUB=-Fe-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-

2018 ◽  
Vol 60 (10) ◽  
pp. 1947
Author(s):  
И.А. Гудим ◽  
А.А. Демидов ◽  
Е.В. Еремин ◽  
D.K. Shukla
Keyword(s):  
Crystal Field ◽  
Field Model ◽  
Field Approximation ◽  
Spin Reorientation ◽  
Magnetization Curves ◽  
Rare Earth Ion ◽  
Spin Reorientation Transition ◽  
Crystal Field Parameters ◽  
The Magnetic Field

AbstractThe magnetic and magnetodielectric properties of Ho_0.5Nd_0.5Fe_3(BO_3)_4 ferroborate with the competing Ho–Fe and Nd–Fe exchange couplings have been experimentally and theoretically investigated. Step anomalies in the magnetization curves at the spin-reorientation transition induced by the magnetic field B ║ c have been found. The spontaneous spin-reorientation transition temperature T _SR ≈ 8 K has been refined. The measured magnetic properties and observed features are interpreted using a single theoretical approach based on the molecular field approximation and calculations within the crystal field model of the rare-earth ion. Interpretation of the experimental data includes determination of the crystal field parameters for Ho^3+ and Nd^3+ ions in Ho_0.5Nd_0.5Fe_3(BO_3)_4 and parameters of the Ho–Fe and Nd–Fe exchange couplings.

The Ground State in Cs2KFe(CN)6 From Single-Crystal Magnetic Properties

1992 ◽  
Vol 45 (8) ◽  
pp. 1301 ◽  
Author(s):  
PA Reynolds ◽  
CD Delfs ◽  
BN Figgis ◽  
B Moubaraki ◽  
KS Murray
Keyword(s):  
Magnetic Properties ◽  
Single Crystal ◽  
Crystal Field ◽  
Ground State ◽  
Field Model ◽  
Inversion Symmetry ◽  
Variable Parameters ◽  
Magnetic Susceptibilities ◽  
Effective Reduction ◽  
Low Symmetry

The single-crystal magnetic susceptibilities from 4.5 to 300 K, and the magnetizations at 4.5 K from 0.25 to 5 T, of Cs2KFe(CN)6 along a, b and c* are reported. The data are fitted well by a crystal field model with splitting of the ground-state 2T2g term of the hexacyanoferrate (III) ion. The three variable parameters of the model were the two representing the low-symmetry splitting of the t2g orbitals, and the effective reduction in the orbital angular momentum. Four other parameters were fixed at values known or estimated from other experiments on hexacyanoferrate (III) ions, including polarized neutron diffraction which determines the orientation of lower-symmetry crystal field components. The crystal field has only inversion symmetry with respect to the ligand axes, with a non-cubic component which is almost uniaxial with respect to the a,b,c * axis system.

Magnetic behavior of the novel pentagonal-bipyramidal Erbium(III) complex (Et3NH)[Er(H2DAPS)Cl2]: high-frequency EPR study and crystal-field analysis

2021 ◽  
Author(s):  
Lena Spillecke ◽  
Changhyun Koo ◽  
Olga Maximova ◽  
Vladimir Sergeevich Mironov ◽  
Вячеслав Копотков ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Crystal Field ◽  
Coordination Polyhedron ◽  
High Frequency ◽  
Magnetic Behavior ◽  
Field Analysis ◽  
The Novel

We report the synthesis, crystal structure and magnetic properties of the new heptacoordinated mononuclear erbium(III) complex (Et3NH)[Er(H2DAPS)Cl2] (H4DAPS = 2,6-diacetylpyridine bis-(salicylhydrazone)) (1). The coordination polyhedron around the Er(III) ion figures...

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