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.

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

scholarly journals EPR of Gd3+ in a Single Crystal of Thorium disulfide (ThS2)

1981 ◽  
Vol 36 (11) ◽  
pp. 1163-1168
Author(s):  
G. Amoretti ◽  
D. C. Giori ◽  
V. Varacca
Keyword(s):  
Single Crystal ◽  
Crystal Field ◽  
Site Symmetry ◽  
Spin Hamiltonian ◽  
Fitting Procedure ◽  
Numerical Fitting ◽  
Crystal Field Symmetry ◽  
Field Symmetry ◽  
Crystal Field Parameters ◽  
Low Symmetry

In this paper we report the experimental angular behaviour of the EPR spectra for a single crystal of Thorium disulfide (ThS2) doped with Gd3+ at very low concentration (of the order of 10 p.p.m.). The experimental data are interpreted in terms of a spin Hamiltonian which reflects the crystal field symmetry at the Th site, that is monoclinic Cs, and therefore shows that the doping ions enter substitutionally without lowering the site symmetry. The low symmetry and the unusually large values of the crystal field parameters b20 and b22 have made it necessary to use a numerical fitting procedure, starting from the exact numerical diagonalization of the energy matrix for any given direction of the static magnetic field.

Magnetische Eigenschaften der Normaltemperaturform von CsTmO2 / Magnetic Properties of the Normal-Temperature Form of CsTmO2

1979 ◽  
Vol 34 (8) ◽  
pp. 997-1002 ◽  
Author(s):  
Werner Urland
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Crystal Field ◽  
Ground State ◽  
Low Temperatures ◽  
Magnetic Behaviour ◽  
Magnetic Data ◽  
Angular Overlap Model ◽  
Temperature Form ◽  
Overlap Model

AbstractThe magnetic behaviour of the normal-temperature-form of CsTmO2 (NT-CsTmO2) has been studied in the temperature range between 2.9 and 251.3 K. In order to interpret the magnetic data a method applying the angular overlap model has been established to assess the crystal-field (CF) parameters of NT-CsTmO2 (CF symmetry: D3d) from the known CF parameters for Tm3+ substituted in YVO4 (CF symmetry: D2d)-With these CF parameters the observed magnetic properties of NT-CsTmO2 can be satisfactorily simulated. The calculation of the paramagnetic principal susceptibilities yields a high magnetic anisotropy, especially at low temperatures. The energy values of the CF levels of the 3H6 ground state are calculated.

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.

Magnetic Susceptibility and Structure of Some Transition Metal (II) Complexes with 1,2,4-Triazole

1977 ◽  
Vol 32 (7) ◽  
pp. 783-784 ◽  
Author(s):  
D. W. Engelfriet ◽  
J. G. Haasnoot ◽  
W. L. Groeneveld
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Transition Metal ◽  
Metal Ions ◽  
Single Crystal ◽  
Two Dimensional ◽  
Single Crystal Diffraction ◽  
Magnetic Susceptibilities ◽  
X Ray

Abstract The magnetic susceptibilities of some transition metal (II) complexes with 1,2,4-triazole (trz) have been measured in the range 2-300 K. Ni (trz)2 (NO3)2 (H2O) 8/3, Ni (trz)2 SO4 (H2O)5 and α-Ni (trz)2 (NCS)2 are found to be linear antiferromagnetic trimers. For β- Ni (trz)2 (NCS)2 and similar compounds with Mn (II), Fe (II), Co (II) and Cu(II), totally different magnetic properties were observed, suggesting the presence of two-dimensional networks of metal ions bridged by 1,2,4-triazole molecules. For Co (trz) 2 (NCS) 2 this was confirmed by X-ray single crystal diffraction.

Single crystal magnetic properties and the crystal field interactions of Er3+ in ErVO4

1997 ◽  
Vol 58 (3) ◽  
pp. 393-397 ◽  
Author(s):  
P.K. Chakrabarti ◽  
D. Neogy ◽  
K.N. Chattopadhyay ◽  
B.M. Wanklyn
Keyword(s):  
Magnetic Properties ◽  
Single Crystal ◽  
Crystal Field
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