Phys. Rev. B 65, 214202 (2002) [5 pages]Anomalous NMR response of quasicrystalline icosahedral Al72.4Pd20.5Mn7.1 at low temperaturesReceived 21 June 2001; revised 8 April 2002; published 24 May 2002 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. 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.214202
DOI:
10.1103/PhysRevB.65.214202
PACS:
61.44.Br, 76.60.-k
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