Electron paramagnetic resonance and spin-lattice relaxation in two-dimensional systems

1995 ◽  
Vol 8 (2) ◽  
pp. 319-333 ◽  
Author(s):  
A. Niang ◽  
G. Ablart ◽  
J. Pescia ◽  
Y. Servant ◽  
R. Duplessix ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Two Dimensional ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Electron Paramagnetic

Electron paramagnetic resonance, acoustic EPR, and spontaneous spin-lattice relaxation at low temperatures

1973 ◽  
Vol 16 (8) ◽  
pp. 1041-1045
Author(s):  
A. V. Alekseev ◽  
Y. Kh. Kopvillem ◽  
V. R. Nagibarov
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Low Temperatures ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Electron Paramagnetic

The detection of phase transitions in NH4Sm(SO4)2∙4H2O single crystals using the electron paramagnetic resonance of Gd3+ impurity ions

1981 ◽  
Vol 59 (4) ◽  
pp. 596-604 ◽  
Author(s):  
H. A. Buckmaster ◽  
V. M. Malhotra ◽  
H. D. Bist
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Orthorhombic Symmetry ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Impurity Ions ◽  
Impurity Ion ◽  
Electron Paramagnetic

The 9.4 GHz electron paramagnetic resonance (epr) of Gd3+ impurity ions in NH4Sm(SO4)2∙4H2O single crystals has been studied at 101–297 K. The 294 K epr spectra show that the Gd3+ impurity ion substitutes for the Sm3+ host ion in two magnetically nonequivalent complexes corresponding to the tetramolecular unit cell. These spectra were analyzed using an orthorhombic symmetry spin-Hamiltonian. The observation of resolved Gd3+ impurity ion spectra in the presence of paramagnetic Sm3+ ions has been interpreted in terms of a random modulation of the interaction between the Gd3+ impurity and Sm3+ host ions by rapid spin–lattice relaxation of the Sm3+ ions. The spin–lattice relaxation time of the Sm3+ ions has been estimated at 294 K from the impurity ion epr linewidths and is found to be consistent with an Orbach resonance process. The value for τ1, has also been computed for Nd3+ ions in NH4Nd(SO4)2∙4H2O from the epr linewidth data in the literature. It has been shown for the first time that NH4Sm(SO4)2∙4H2O single crystals have the phase transition sequence[Formula: see text]

The use of the electron paramagnetic resonance of Gd3+ impurity ions and infrared spectra to study the phase transitions in NH4Ce(SO4)2∙4H2O single crystals

1980 ◽  
Vol 58 (12) ◽  
pp. 1667-1676 ◽  
Author(s):  
V. M. Malhotra ◽  
H. A. Buckmaster ◽  
H. D. Bist
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Infrared Spectra ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Impurity Ions ◽  
Impurity Ion ◽  
Electron Paramagnetic

The 9.4 GHz electron paramagnetic resonance (epr) of Gd3+ impurity ions in NH4Ce(SO4)2∙4H2O single crystals has been studied at 97–304 K. The Gd3+ impurity ion is found to substitute for the trivalent lanthanide ion in two inequivalent magnetic complexes corresponding to the tetramolecular unit cell. The epr spectra at 304 K have been analyzed using an orthorhombic symmetry spin-Hamiltonian. The observation of resolved Gd3+ impurity ion spectra in the presence of paramagnetic Ce3+ ions has been interpreted in terms of a random modulation of the interaction between the Gd3+ impurity and Ce3+ host ions by rapid spin–lattice relaxation of Ce3+ ions. The 304 K spin–lattice relaxation time of the Ce3+ ions has been estimated from the impurity ion epr linewidths and is found to be consistent with an Orbach process. It has been shown for the first time that NH4Ce(SO4)2∙4H2O single crystals have a phase transition sequence[Formula: see text]The infrared spectra of NH4Ce(SO4)2∙4H2O were studied at 120 and 303 K and the results are reported.

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