Anomalous NMR response of quasicrystalline icosahedral A72.4Pd20.5Mn7.1 at low temperatures
J. L. Gavilano, D. Rau, Sh. Mushkolaj, H. R. Ott, J. Dolinsek, K. Urban
Abstract
We report the observation of an anomalous 27Al-NMR response of a single grain Al72.4Pd20.5Mn7.1 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 T1-1 and by a maximum of the spin-spin relaxation time T2(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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