11B and 27Al NMR spin-lattice relaxation and Knight shift of Mg1-xAlxB2: Evidence for an anisotropic Fermi surface

G. Papavassiliou, M. Pissas, M. Karayanni, M. Fardis, S. Koutandos, K. Prassides

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We report a detailed study of the 11B and 27Al NMR spin-lattice relaxation rates (1/T1) and the 27Al Knight shift (K) in Mg1-xAlxB2, 0<x<1. 1. The evolution of (1/T1T) and K with x is in excellent agreement with the prediction of ab initio calculations of a highly anisotropic Fermi surface, consisting mainly of hole-type two-dimensional (2D) cylindrical sheets from bonding 2px,y boron orbitals. The density of states at the Fermi level also decreases sharply on Al doping and the 2D sheets collapse at x≈0.55, where the superconducting phase disappears.

Original languageEnglish
Article number140514
Pages (from-to)1405141-1405144
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number14
Publication statusPublished - 2002 Oct 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of '<sup>11</sup>B and <sup>27</sup>Al NMR spin-lattice relaxation and Knight shift of Mg<sub>1-x</sub>Al<sub>x</sub>B<sub>2</sub>: Evidence for an anisotropic Fermi surface'. Together they form a unique fingerprint.

  • Cite this

    Papavassiliou, G., Pissas, M., Karayanni, M., Fardis, M., Koutandos, S., & Prassides, K. (2002). 11B and 27Al NMR spin-lattice relaxation and Knight shift of Mg1-xAlxB2: Evidence for an anisotropic Fermi surface. Physical Review B - Condensed Matter and Materials Physics, 66(14), 1405141-1405144. [140514].