Materials and Nanoscience, Nebraska Center for (NCMN)


Date of this Version



Published in PHYSICAL REVIEW B, VOLUME 64, 132506. ©2001 The American Physical Society. Used by permission.


We calculated the nuclear spin-lattice relaxation rate in the Mg1-xAlxB2 system and found that the orbital relaxation mechanism dominates over the dipolar and Fermi-contact mechanisms in MgB2, whereas in AlB2 due to a smaller density of states and strong anisotropy of boron p orbitals the relaxation is completely determined by Fermi-contact interaction. The results for MgB2 are compared with existing experimental data. To validate the theory, nuclear resonance experiments for the studied diboride alloy system are needed.