Spin-Wave Description of Nuclear Spin-Lattice Relaxation inMn12O12Acetate

Spin-wave description of nuclear spin-lattice relaxation in Mn12O12 acetate.

In response to recent nuclear-magnetic-resonance (NMR) measurements on the molecular cluster Mn12O12 acetate, we study the nuclear spin-lattice relaxation rate 1/T(1), developing a modified spin-wave theory. Our microscopic new approach, which is distinct from previous macroscopic treatments of the cluster as a rigid spin of S=10, not only excellently interprets the observed temperature and app...

Spin-lattice relaxation of a nuclear antiferromagnet

2014 We consider the influence of antiferromagnetic nuclear ordering on the spin-lattice relaxation of the nuclear dipolar energy by paramagnetic impurities. The predictions are different depending whether the correlation time 03C4c of the spin-lattice coupling is shorter or longer than T2. When 03C4c ~ T2, relaxation is slower in the antiferromagnetic than in the paramagnetic state. When 03C4c...

Spin-wave contribution to the nuclear spin-lattice relaxation in triplet superconductors.

We discuss collective spin-wave excitations in triplet superconductors with an easy axis anisotropy for the order parameter. Using a microscopic model for interacting electrons, we estimate the frequency of such excitations in Bechgaard salts and ruthenate superconductors to be 1 and 20 GHz, respectively. We introduce an effective bosonic model to describe spin-wave excitations and calculate th...

Structural Applications of Nuclear Spin-lattice Relaxation Times

The structural utility of three mechanisms of nuclear spin relaxation are considered. Examples illustrating the applicability of nuclear-nuclear dipolar relaxation in determining molecular microdynamics and solution geometry are presented. The use of spin-rotation relaxation to determine barriers to CH3 groups rotations and an example of quadrupole relaxation of deuteriums to probe molecular mo...

Nuclear spin relaxation rate of disordered px+ ipy-wave superconductors