Influence of Jahn-Teller Ions on Spin-Lattice Relaxation in Ferrimagnets

2001 ◽  
pp. 269-272 ◽  
Author(s):  
Gerald F. Dionne
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Jahn Teller

Theory of Tunneling Assisted Electron Spin–Lattice Relaxation

1971 ◽  
Vol 49 (12) ◽  
pp. 1620-1629 ◽  
Author(s):  
K. P. Lee ◽  
D. Walsh
Keyword(s):  
Lattice Relaxation ◽  
Zeeman Splitting ◽  
Spin Lattice Relaxation ◽  
Phonon Coupling ◽  
Orbital State ◽  
Strongly Coupled ◽  
Practical Applications ◽  
Spin Lattice ◽  
Jahn Teller ◽  
Temperature Relaxation

It is shown for an Eg orbital state and a tunneling splitting which is small compared with the Zeeman splitting that a strong Jahn–Teller coupling can lead to an enhancement of the direct spin–phonon coupling by several orders of magnitude. By comparing the theory with low temperature relaxation measurements on Cu2+ in a double nitrate the magnitude of several of the significant parameters associated with the Jahn–Teller problem is derived. A T2g orbital state strongly coupled to t2g modes of vibration can also have a strong spin–phonon coupling; the corresponding situation is briefly discussed.The strong coupling of the vibronic states to the lattice and the considerable range in the strength of this coupling have a number of practical applications.

Fullerenes Under Pressure Studied by 13C-NMR

1994 ◽  
Vol 359 ◽  
Author(s):  
Pascale Auban-Senzier ◽  
R. Kerkoud ◽  
D. Jerome ◽  
F. Rachdi ◽  
P. Bernier
Keyword(s):  
Ambient Pressure ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Doped Fullerenes ◽  
Jahn Teller ◽  
Exponential Behaviour ◽  
Superconducting Compound ◽  
Coulomb Correlations ◽  
C Nmr

ABSTRACTHigh pressure is an important parameter for the study of C60 and doped fullerenes as these molecular crystals are very compressible. 13C-NMR experiments under pressure in K3C60 have given access to the determination of the 13C Knight shift and the chemical shift of this superconducting compound. These NMR data do not reveal significant effects of Coulomb correlations in K3C60 and support a pairing mechanism for superconductivity mediated by intramolecular vibrations.We report also a 13C-NMR investigation of Rb4C60 under pressure and temperature. The temperature dependence of the spin-lattice relaxation rate clearly shows, under pressure, the increase of a linear contribution which gradually substitutes to the exponential behaviour present at ambient pressure. The activated relaxation is attributed to intrinsic spin excitations through the direct Jahn-Teller gap whereas the closing of a small indirect gap under pressure gives rise to a semimetal and a Korringa like relaxation.

Spin lattice relaxation of a Jahn-Teller system

1986 ◽  
Vol 143 ◽  
pp. 175-178
Author(s):  
E.J. Reijerse ◽  
N.A.J.M. van Aerle ◽  
C.P. Keijzers ◽  
E. de Boer
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Jahn Teller

EPR and spin-lattice relaxation of the Jahn-Teller system:Cu2+in Zn(BrO3)2·6H2O

1977 ◽  
Vol 16 (7) ◽  
pp. 3012-3015 ◽  
Author(s):  
A. Jesion ◽  
Y. H. Shing ◽  
D. Walsh
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Jahn Teller

Spin-Lattice Relaxation Anisotropy for a Dynamic Jahn-Teller System

1973 ◽  
Vol 31 (17) ◽  
pp. 1036-1038 ◽  
Author(s):  
Y. H. Shing ◽  
C. Vincent ◽  
D. Walsh
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Jahn Teller

35Cl NQR Spin-Lattice Relaxation in Paramagnetic CuPtCl6 · 6H2O

1990 ◽  
Vol 45 (3-4) ◽  
pp. 527-530 ◽  
Author(s):  
Motohiro Mizuno ◽  
Tetsuo Asaji ◽  
Daiyu Nakamura ◽  
Keizo Horiuchi
Keyword(s):  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Nuclear Relaxation ◽  
Dipolar Interactions ◽  
Reorientational Motion ◽  
Spin Lattice ◽  
Nuclear Spin Lattice Relaxation ◽  
35Cl Nqr ◽  
Jahn Teller

Abstract35Cl NQR spin-lattice relaxation times T1Q of paramagnetic CuPtCl6 · 6H2O were measured as a function of temperature. Below the cooperative Jahn-Teller phase transition at Tc = 136 K, an almost temperature independent T1Q between 0.6 and 1 ms was obtained for each line of the triplet observed. This suggests that the nuclear spin-lattice relaxation of chlorine is dominantly determined by magnetic dipolar interactions between chlorine nuclei and electron spins. No marked anomaly in the nuclear relaxation rate was detected at T c . Above Tc , T1Q for the single 35Cl NQR line increased from 0.6 ms at Tc to 1-4 ms at 365 K. The rapid T 1Q decrease observed above ca. 390 K can be attributed to a reorientational motion of the [PtCl6]2- anion with an activation energy of 1.1 x 102 kJ mol-1 .

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