Li, Lilong and Schoers, Jan and Wu, Yue (2003) Crossover of Microscopic Dynamics in Metallic Supercooled Liquid Observed by NMR. Physical Review Letters, 91 (26). Art. No. 265502. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:LILprl03b
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Nuclear magnetic resonance is used to characterize local atomic motions in the glassy and supercooled liquid states of the bulk metallic glass system Pd43Ni10Cu27P20. The temperature dependence of the Knight shift reveals that certain local atomic motion decreases rapidly below a crossover temperature Tc down to the glass transition temperature Tg. Above Tc as well as below Tg the mean-squared amplitude of local motions depends linearly on the temperature. The observed gradual transition below Tc is inconsistent with heterogeneity effects. It reveals that qualitative changes of microscopic properties in the supercooled liquid take place at temperatures significantly above Tg.
|Additional Information:||©2003 The American Physical Society Received 7 July 2003; published 29 December 2003 We thank Professor W. L. Johnson, Professor J. Hernandez, and Professor T. Egami for very helpful discussions. This work was supported by the U.S. Army Research Office (Grant No. DAAD19-02-1-0225) and by the National Science Foundation (Grant No. DMR-0139452).|
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|Deposited On:||17 Aug 2007|
|Last Modified:||26 Dec 2012 09:39|
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