Simultaneous measurements of heat capacity and spin‐lattice relaxation time in high magnetic field at low temperature

1996 ◽  
Vol 67 (12) ◽  
pp. 4256-4260 ◽  
Author(s):  
B. Andraka ◽  
Y. Takano
Keyword(s):  
Magnetic Field ◽  
Heat Capacity ◽  
Relaxation Time ◽  
Low Temperature ◽  
High Magnetic Field ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Simultaneous Measurements

SPIN-LATTICE RELAXATION BY THE DIRECT PROCESS OF Fe3+ IN POTASSIUM COBALTICYANIDE

1966 ◽  
Vol 44 (12) ◽  
pp. 3185-3196
Author(s):  
C. F. Weissfloch
Keyword(s):  
Magnetic Field ◽  
Relaxation Time ◽  
Point Charge ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Potassium Ferricyanide ◽  
Spin Lattice Relaxation ◽  
Direct Process ◽  
Spin Lattice ◽  
Satisfactory Prediction

The spin-lattice relaxation time of dilute potassium ferricyanide was measured as a function of the orientation of the static magnetic field in three orthogonal planes at 9.4 GHz and 1.75 °K.A calculation of the spin-phonon Hamiltonian applicable to the case of three Kramer doublets degenerate with respect to the cubic component of the crystalline bond is given. The theory was applied to the ferricyanide on the basis of Van Vleck's point-charge model.Despite the fact that the ferricyanide complex is known to be considerably covalent, it is found that the theory gives a satisfactory prediction of the observed angular dependence.

Calculated Spin-lattice Relaxation of 103Ru Compared with Low Temperature Quadrupole Orientation Measurements

1994 ◽  
Vol 49 (1-2) ◽  
pp. 395-400 ◽  
Author(s):  
R. Markendorf
Keyword(s):  
Relaxation Time ◽  
Low Temperature ◽  
Reference Value ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Axially Symmetric ◽  
Quadrupole Field ◽  
Spin Lattice ◽  
Temperature Relaxation

Abstract The spin-lattice relaxation time T1 in 103Ru has been determined on the basis of the Dirac theory and strict relativistic band structure calculations. The low temperature relaxation time T(of 103Ru in an axially symmetric quadrupole field and the quadrupole moment Q have been measured by Green and Stone using the technique of low temperature quadrupole orientation. For the usual reference value T1 T, which corresponds to relaxation in a Zeeman spectrum, they obtain 39(6) sK, which exceeds our value by 134%. This large discrepancy is attributed to the fact that the spin relaxation by direct quadrupole scattering of conduction electrons, the so-called Mitchell contribution, is dominant. According to our calculations it amounts to 81% of the total relaxation rate. This contribution could not be included in the evaluation of the experimental data.

Low Temperature Isotope Effect in Ammonium Hexachloroselenate(IV) Studied by 35Cl NQR

1994 ◽  
Vol 49 (1-2) ◽  
pp. 297-301 ◽  
Author(s):  
Y. Kume ◽  
T. Asaji ◽  
R. Ikeda
Keyword(s):  
Relaxation Time ◽  
Phase Transitions ◽  
Low Temperature ◽  
Transition Point ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Soft Modes ◽  
35Cl Nqr

Abstract The temperature dependence o f the 35Cl NQR frequency and spin-lattice relaxation time T1Q of (NH4)2SeCl6 and (ND4)2SeCl6 were measured from 400 K to 24.8 and 53.8 K, respectively. The disappearance of NQR signals in the low temperature region of both salts is attributed to phase transitions. We concluded from the temperature behavior of just above the transition point that the operative mechanism o f the transition is different in these salts: The transition of (ND4)2SeCl6 seems to be associated with rotary soft modes, while in the natural salt non-rotary soft modes seem to play an important role at the transition.

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