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TT: Tiefe Temperaturen

TT 21: Postersitzung III: Spin-Peierls-Systeme, Metall-Isolator-Übergang, Lokalisierung; SL: Theorie; Quantenflüssigkeiten und -kristalle; Amorphe Materialien, Tunnelsysteme; Borcarbide, Fullerene, konventionelle SL; SL dünner Filme; Experimentiertechniken

TT 21.25: Poster

Donnerstag, 26. März 1998, 15:00–18:30, D

Anderson transition in three-dimensional disordered systems with random magnetic flux — •B. Kramer¹, T. Kawarabayashi², and T. Ohtsuki³ — ¹I. Institut f"ur Theoretische Physik, Universit"at Hamburg, Jungiusstraße 9, D-20355 Hamburg — ²ISSP, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan — ³Department of Physics, Sophia University, Kioi-cho 7-1, Chiyoda-ku, Tokyo 102, Japan

The Anderson transition in three dimensions in a randomly varying magnetic flux ist investigated in detail by using the transfer matrix method with high accuracy. Both systems with and without an additional random scalar potential are considered. Our data suggest that the critical behavior is the same in both cases, namely ν =1.45±0.09. This coincides with previous results for the case of a homogeneous magnetic field. Thus, the conventional classification of universality classes due to symmetry of the disorder-induced metal-insulator transition is supported by these results.

[1] T. Ohtsuki, Y. Ono, B. Kramer, J. Phys. Soc. Japan, 63, 685 (1994)

[2] M. Henneke, T. Ohtsuki, B. Kramer, Europhys. Lett. 27, 389 (1994)

[3] K. Slevin, T. Ohtsuki, Phys. Rev. Lett. 78, 4083 (1997)

[4] T. Kawarabayashi, B. Kramer, T. Ohtsuki, preprint