Fine Structure in Electron Paramagnetic Resonance ofMn2+in Zinc Sulfate

1969 ◽  
Vol 180 (2) ◽  
pp. 445-450 ◽  
Author(s):  
D. J. Sukle ◽  
J. S. Wells
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Zinc Sulfate ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

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.

scholarly journals Особенности высокочастотного спектрометра электронного парамагнитного резонанса с модуляцией частоты

2020 ◽  
Vol 46 (9) ◽  
pp. 47
Author(s):  
Р.А. Бабунц ◽  
А.С. Гурин ◽  
Ю.А. Успенская ◽  
Г.Р. Асатрян ◽  
Д.О. Толмачев ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Frequency Modulation ◽  
High Frequency ◽  
Garnet Crystal ◽  
Paramagnetic Centers ◽  
Paramagnetic Resonance ◽  
Fine Structure Splitting ◽  
Structure Splitting ◽  
Electron Paramagnetic

A high-frequency electron paramagnetic resonance (EPR) spectrometer with frequency modulation was developed. The advantages of the method for recording the EPR spectra of paramagnetic centers with giant fine-structure splitting in the case of non-Kramers ions in a garnet crystal were demonstrated.

EPR Studies of Mn2+-Doped Diammonium Hexaaqua Magnesium(II) Sulfate

2006 ◽  
Vol 61 (12) ◽  
pp. 683-687 ◽  
Author(s):  
Ram Kripal ◽  
Ashutosh Kumar Shukla
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Single Crystals ◽  
Room Temperature ◽  
Spin Hamiltonian ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
X Band ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Electron paramagnetic resonance (EPR) studies of Mn2+ impurity in single crystals of diammonium hexaaqua magnesium(II) sulfate have been carried out at 9.3 GHz (X-band) at room temperature. The EPR spectra exhibit a group of five fine structure transitions. The spin-Hamiltonian parameters were determined. Mn2+ enters the lattice interstitially. The EPR spectrum of a powder sample supports the data obtained by single crystal studies. - PACS number: 76.30

Magnetic properties of Gd-doped PbTe

1986 ◽  
Vol 64 (10) ◽  
pp. 1345-1347 ◽  
Author(s):  
F. T. Hedgcock ◽  
P. C. Sullivan ◽  
J. T. Grembowicz ◽  
M. Bartkowski
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Properties ◽  
Fine Structure ◽  
Composition Range ◽  
Ac Susceptibility ◽  
Paramagnetic Resonance ◽  
Low Field ◽  
Electron Paramagnetic ◽  
Rare Earth Doped ◽  
Curie Temperatures

Electron paramagnetic resonance (EPR) and low-field ac susceptibility measurements were done on the rare-earth-doped semimagnetic semiconductor PbGdTe for the Gd composition range 100 ppm–10 at.%. For the lower concentrations, the EPR results indicate a fully resolved fine structure appropriate to the Gd3+ ion and g values close to the free-electron value. Susceptibility results show Curie–Weiss behaviour in all samples for temperatures above 10 K, small negative Curie temperatures, and Peff values corresponding to a Gd spin of 7/2. Deviations from this simple behaviour are observed for Gd concentrations greater than 5 at.% and for temperatures below 10 K. Evidence is observed for an antiferromagnetic clustering of impurity spins.

Electron Paramagnetic Resonance Studies of Impurity Defects in PbTiO3

1997 ◽  
Vol 51 (1) ◽  
pp. 117-122 ◽  
Author(s):  
D. J. Keeble ◽  
E. H. Poindexter ◽  
G. J. Gerardi
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Low Temperature ◽  
Local Structure ◽  
Metal Ion ◽  
Near Neighbor ◽  
Paramagnetic Resonance ◽  
Impurity Defects ◽  
Electron Paramagnetic

Electron paramagnetic resonance studies of metal ion impurities in the perovskite titan ate PbTiO3 are presented. Results for Pt+3, Mn+4, and Cu+2 are given, and near-neighbor superhyper fine structure (shfs) splittings for the first Pb shell are reported for these ions at low temperature. The relation between the shfs and the local structure of the ion is discussed.

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.

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