Anomalous NMR response of quasicrystalline icosahedral A_{72.4}Pd_{20.5}Mn_{7.1} at low temperatures

Details Anomalous NMR response of quasicrystalline icosahedral A_{72.4}Pd_{20.5}Mn_{7.1} at low temperatures Anomalous NMR response of quasicrystalline icosahedral A_{72.4}Pd_{20.5}Mn_{7.1} at low temperatures

2001-06-21

arxiv.org/abs/cond-mat/0106447v1

Physics

Condensed Matter

Materials Science

5 pages, 5 figures, submitted to Phys. Rev B (Rapid Commun.)

Scientific paper

10.1103/PhysRevB.65.214202

We report the observation of an anomalous {27}Al-NMR response of a single grain Al_{72.4}Pd_{20.5}Mn_{7.1} icosahedral quasicrystal at low temperatures. In an external magnetic field of 6 T and upon decreasing temperature, we observe a sharp 100 % increase of the resonance linewidth at 2.5 K. No further changes of the linewidth are observed down to 0.05 K. The linewidth enhancement is accompanied by a small but distinct increase of the spin-lattice relaxation rate T_{1}^{-1} and by a maximum of the spin-spin relaxation time T_{2}(T). All these anomalies are absent in external fields of 2.5 T and below. Our observations indicate unusual variations in the stability of isolated magnetic moments in a quasiperiodic metallic environment.

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