Random Fields and Ordering in Antiferromagnetic Insulators

摘要

Neutron scattering measurements of the effect on the long range order and phase transitions of random magnetic fields are reviewed. The results at low temperatures in Rb sub 2 Co/sub x/Zn/sub 1-x/F sub 4 and Co/sub x/Zn/sub 1-x/F sub 2 show that the long range order is not established when samples are cooled in a magnetic field, but they form a state with unusually long magnetic correlations. In Mn/sub x/Zn/sub 1-x/F sub 2 a similar state is formed but only very close in temperature to T/sub N/. (ERA citation 07:061784)