標題: Inelastic electron dephasing scattering times in disordered metals
作者: Lin, JJ
物理研究所
Institute of Physics
關鍵字: dephasing times;electron-phonon relaxation;electron-electron relaxation;disordered metals
公開日期: 1-Apr-2000
摘要: We have studied and compared the inelastic electron dephasing scattering times in disordered metals with significantly different characteristics. Both the temperature dependence and electron elastic mean-free-path (I) dependence of the electron-phonon scattering times, tau(ep), are determined from weak-localization studies. Our experimental results suggest that tau(ep)(-1) similar to T-2 in numerous crystalline disordered dilute Ti1-xAlx, dilute Ti1-xSnx, Au50Pd50, and Ti73Al27 alloys. However, our results do not support a universal dependence of tau(ep)(-1) on l among these various metals. Our observation of the T-2-law is in disagreement with current theoretical concept for electron-phonon interaction in disordered metals. In addition, we have inferred the critical electron-electron scattering times, tau(EE), in a number of very low-diffusivity thick Sc, RuO2, and IrO2 films. We find that tau(EE)(-1) similar to T and also that tau(EE)(-1) is independent of l. This observation is understood in terms of the current theory for inelastic electron-electron scattering in bulk metals near the mobility edge. Our results altogether establish a crossover of the inelastic electron dephasing from electron-phonon scattering to electron-electron scattering as the amounts of disorder greatly increase and the systems move significantly toward the Anderson transition. (C) 2000 Elsevier Science B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/S0921-4526(99)00732-2
http://hdl.handle.net/11536/30614
ISSN: 0921-4526
DOI: 10.1016/S0921-4526(99)00732-2
期刊: PHYSICA B
Volume: 279
Issue: 1-3
起始頁: 191
結束頁: 195
Appears in Collections:Conferences Paper


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