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VOLUME 59 (1994) | ISSUE 11 | PAGE 788
Cooperative transport phenomena in phase-separated degenerate antiferromagnetic semiconductors
The response to a strong electric field of degenerate antiferromagnetic semiconductors EuTe, which are spontaneously separated into antiferromagnetic and ferromagnetic phases, is investigated. While in weak fields their response is ohmic, in strong fields a sequence of very high peaks appears against the ohmic-type background, beginning at a certain threshold field strength. Their spacing decreases with increasing field strength. These peaks can be explained by the cooperative motion of charged ferromagnetic microregions inside the antiferromagnetic host.