Anisotropy of p states and 11B nuclear spin-lattice relaxation in (Mg,Al)B2

Abstract

We calculated the nuclear spin-lattice relaxation rate in the (Mg,Al)B2 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, whereas our results for the doped alloy and AlB2 can be used in future experiments to verify the theoretical predictions about the electronic structure of this system.

3 pages, 1 figure

References in corpus (3)

• Superconductivity of metallic boron in MgB_2
• Superconductivity of MgB2: Covalent Bonds Driven Metallic
• ${}^{11}B$ NMR and Relaxation in $Mg{B}_2$ Superconductor

Cited by in corpus (8)

• Electronic Structure, Electron-Phonon Coupling, and Multiband Effects in MgB2
• Review of superconducting properties of MgB2
• ${}^{11}$B and ${}^{27}$Al NMR spin-lattice relaxation and Knight shift study of Mg${}_{1-x}$Al${}_x$B${}_2$. Evidence for anisotropic Fermi surface
• A magnetization and ${}^{11}$B NMR study of Mg${}_{1-x}$Al${}_x$B${}_2$ superconductors
• NMR relaxation time in a clean two-band superconductor
• Effect of disorder on the NMR relaxation rate in two-band superconductors
• Nonmagnetic impurity effects in MgB${}_2$
• ${}^{11}$B NMR study of pure and lightly carbon doped MgB${}_2$ superconductors