EPR study of antiferromagnetic ordering in CrVO4

1969 ◽  
Vol 47 (17) ◽  
pp. 1865-1867 ◽  
Author(s):  
P. R. Elliston
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Line Width ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Intensity Data ◽  
Néel Temperature ◽  
Paramagnetic Resonance ◽  
Antiferromagnetic Ordering ◽  
Electron Paramagnetic

The intensity and line width of the electron paramagnetic resonance have been studied above the Néel temperature in polycrystalline CrVO4. The intensity data give TN = 51 ± 1 °K. Both the intensity and line-width data suggest considerable short-range order above TN.

Electron paramagnetic resonance of magnetic clusters in Pb1−xGdxTe

1987 ◽  
Vol 65 (8) ◽  
pp. 1023-1026 ◽  
Author(s):  
M. Bartkowski ◽  
D. J. Northcott ◽  
J. M. Park ◽  
A. H. Reddoch ◽  
D. F. Williams ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Line Width ◽  
Quantum Interference ◽  
Ac Susceptibility ◽  
Magnetic Clusters ◽  
Paramagnetic Resonance ◽  
Weiss Temperature ◽  
Sample Rotation ◽  
Electron Paramagnetic

Measurements of electron paramagnetic resonance (EPR) and of susceptibility with a superconducting quantum interference device (SQUID) have been performed on Pb0.995Gd0.005Te crystals from 4.2 to 300 K. The EPR spectra consist of two components, one showing the fine structure of Gd3+ ions in a cubic environment and the other a broad line, which we attribute to clusters of interacting Gd ions. The resonant field of the cluster line is almost isotropic under sample rotation in the [Formula: see text] crystallographic plane, while the line width varies by a factor of 2.5 between [100] and 30° from it. This result suggests that an exchange-narrowing mechanism is responsible for the cluster line. The ratio of cluster-line intensity to fine-structure intensity increases with decreasing temperature down to 10 K and then decreases. This decrease may be related to the spin freeze-out seen in ac susceptibility. The line-width broadening of the cluster and the single-ion lines are similar below 20 K, with a higher rate for the cluster line. The Curie–Weiss temperature is negative and small for both clustered and single spins, reflecting a weak antiferromagnetic interaction.

ELECTRON PARAMAGNETIC RESONANCE OF MANGANESE IN CESIUM AND AMMONIUM CHLORIDES

1967 ◽  
Vol 45 (10) ◽  
pp. 3381-3386 ◽  
Author(s):  
A. Forman ◽  
J. A. Van Wyk
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Line Width ◽  
Structure Parameter ◽  
Manganese Ions ◽  
Spin Hamiltonian ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

The spin-Hamiltonian parameters describing the EPR spectrum of Mn2+ in CsCl crystals grown from solutilon have been determined. The line-width data are in agreement with the manganese ions being incorporated interstitially rather than substitutionally for Cs+ ions. From the work on Mn2+ in NH4Cl we infer that the fine structure parameter, D2, is negative.

Electron Paramagnetic Resonance (34 and 55 GHz) Studies of Hemoproteins

1973 ◽  
Vol 51 (8) ◽  
pp. 1142-1153 ◽  
Author(s):  
A. L. Gray ◽  
H. A. Buckmaster
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Frequency Dependence ◽  
Line Width ◽  
Measurement Techniques ◽  
Single Type ◽  
Zero Field ◽  
Zero Field Splitting ◽  
Paramagnetic Resonance ◽  
Field Splitting ◽  
Electron Paramagnetic

Measurements of the 34 and 55 GHz electron paramagnetic resonance (E.P.R.) spectra of single type A crystals of metmyoglobin, metmyoglobin fluoride and methemoglobin and polycrystalline metmyoglobin and methemoglobin at 77 K are reported. The frequency dependence of the g-values of metmyoglobin, metmyoglobin fluoride, and methemoglobin is used to estimate the zero-field splitting (2D). It is found that (2D) [Formula: see text], (2D) (MbF) = (8.1 ± 1.0) cm−1, and 15 cm−1 <(2D) (HbH2O). The observed angular E.P.R. line width variation of these hemoproteins is compared with the variation predicted by a misorientation hypothesis. The frequency dependence of these line widths is also studied and shown to be consistent with a statistical variation in the zero-field splitting. The g-value and line width measurements are compared with those reported previously and the estimates of the zero-field splitting are compared with the values obtained using other measurement techniques.

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