### Resumé

Originalsprog | Engelsk |
---|---|

Tidsskrift | Reviews of Modern Physics |

Vol/bind | 72 |

Udgave nummer | 3 |

Sider (fra-til) | 873-892 |

ISSN | 0034-6861 |

Status | Udgivet - 2000 |

### Citer dette

*Reviews of Modern Physics*,

*72*(3), 873-892.

}

*Reviews of Modern Physics*, bind 72, nr. 3, s. 873-892.

**Universality of ac conduction in disordered solids.** / Dyre, Jeppe; Schrøder, Thomas.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

TY - JOUR

T1 - Universality of ac conduction in disordered solids

AU - Dyre, Jeppe

AU - Schrøder, Thomas

PY - 2000

Y1 - 2000

N2 - The striking similarity of ac conduction in quite different disordered solids is discussed in terms of experimental results, modeling, and computer simulations. After giving an overview of experiment, a macroscopic and a microscopic model are reviewed. For both models the normalized ac conductivity as a function of a suitably scaled frequency becomes independent of details of the disorder in the extreme disorder limit, i.e., when the local randomly varying mobilities cover many orders of magnitude. The two universal ac conductivities are similar, but not identical; both are examples of unusual non-power-law universalities. It is argued that ac universality reflects an underlying percolation determining dc as well as ac conductivity in the extreme disorder limit. Three analytical approximations to the universal ac conductivities are presented and compared to computer simulations. Finally, model predictions are briefly compared to experiment.

AB - The striking similarity of ac conduction in quite different disordered solids is discussed in terms of experimental results, modeling, and computer simulations. After giving an overview of experiment, a macroscopic and a microscopic model are reviewed. For both models the normalized ac conductivity as a function of a suitably scaled frequency becomes independent of details of the disorder in the extreme disorder limit, i.e., when the local randomly varying mobilities cover many orders of magnitude. The two universal ac conductivities are similar, but not identical; both are examples of unusual non-power-law universalities. It is argued that ac universality reflects an underlying percolation determining dc as well as ac conductivity in the extreme disorder limit. Three analytical approximations to the universal ac conductivities are presented and compared to computer simulations. Finally, model predictions are briefly compared to experiment.

M3 - Journal article

VL - 72

SP - 873

EP - 892

JO - Reviews of Modern Physics

JF - Reviews of Modern Physics

SN - 0034-6861

IS - 3

ER -