f - 1 NOISE IN TWO-PHASE STRUCTURES OF HASHIN-SHTRIKMAN TYPE: EXACT RESULTS.

被引：0
|
作者：
Wolf, M. [1 ]
Mueller, K.-H. [1 ]
机构：
[1] Akad der Wissenshaften der DDR,, Zentralinstitut fuer, Festkoerperphysik und, Akad der Wissenshaften der DDR, Zentralinstitut fuer Festkoerperphysik und Werkstofforschung, Dresd
来源：
Physica Status Solidi (A) Applied Research | 1985年 / 92卷 / 02期
关键词：
NOISE; SPURIOUS SIGNAL - Thermal Noise;
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摘要：
It is well known that a dc current in a linear response sample causes voltage fluctuations additional to the thermal or Nyquist noise. In a homogeneous material the spectral density S//u(f) of these voltage fluctuations (f** minus **1 noise) caused by a homogeneous dc current density is given by S//u/U**2 equals f** minus **1 c/v with f the frequency, U the dc voltage across the sample, v the total sample volume. The noise intensity c is a material constant. For a heterogeneous, macroscopically homogeneous, and isotropic material the effective c is expressed by a given equation. In this paper the relation between c and the effective conductivity sigma is discussed.
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