FIZIKA A 8 (1999) 3 , 99-106

LETTER TO THE EDITOR

ORIENTATION-DEPENDENT NMR SPECTRA OF A SINGLE-GRAIN ICOSAHEDRAL Al-Pd-Mn QUASICRYSTAL

M. KLANJŠEK, T. APIH and J. DOLINŠEK

J. Stefan Institute, Jamova 39, SLO-1000 Ljubljana, Slovenia
E-mail: jani.dolinsek@ijs.si     Fax: +386 61 126 3269

Dedicated to Professor Boran Leontić on the occasion of his 70^th birthday

Received 3 November 1999; revised manuscript received 9 February 2000
Accepted 22 February 2000

Orientation-dependent ²⁷Al quadrupole-perturbed NMR spectra of a single-grain Al_72.4Pd_20.5Mn_7.1 icosahedral quasicrystal are reported. The dependence on orientation is a consequence of a spatially anisotropic distribution of orientations of the electric field gradient tensor at the inequivalent lattice sites. The results demonstrate that the NMR spectra of quasicrystalline single-grain samples of a macroscopic symmetry as high as icosahedral are orientation-dependent and differ from the orientation-independent spectra of powder samples, in contrast to previous reports.

PACS numbers: 61.44.Br, 76.60.-k
UDC 538.955

Keywords: icosahedral quasicrystal, Al_72.4Pd_20.5Mn_7.1, single-grain, ²⁷Al quadrupole-perturbed NMR spectra, dependence on orientation

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