Infrared optical properties of chromium nanoscale films with a phase transition

被引：42
作者：
Lovrincic, Robert [1 ]
Pucci, Annemarie [1 ]
机构：
[1] Univ Heidelberg, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 20期
关键词：
QUANTUM SIZE; THIN-FILMS; FCC CR; SUPERCONDUCTIVITY; CONDUCTIVITY; ABSORPTION; MGO(001); DIAMOND; GROWTH;
D O I：
10.1103/PhysRevB.80.205404
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Thickness-dependent infrared spectra measured during growth of Cr on diamond C(100) under ultrahigh vacuum conditions reveal a structural phase transition from a discontinuous phase to the crystalline bulk one with Drude-type optical properties. The thickness of 2.5 nm of the observed phase transition well agrees with literature data on the theoretically predicted maximum size for stable fcc nanoclusters the formation of which should be supported on C(100) owing to a good lattice match. Below 2.5 nm, the spectral behavior surprisingly well corresponds to a Drude-Smith type dielectric function, which allows one to determine the conductivity for the discontinuous phase and to get quantitative information on the effect of coherent backscattering.
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页数：6
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