Low-field remanent magnetization in the weak ferromagnet Mn[N(CN)(2)](2). Evidence for spin flop behavior

Low-field de magnetization measurements have been performed on powder sampl es of the weak ferromagnet Mn[N(CN)(2)](2). In small de fields, H (0.01 les s than or equal to H less than or equal to 100 Oe), the zero-field and fiel d-cooled magnetizations display the onset of a spontaneous moment below T-c = 15.85(3) K, giving small magnetization values which suggest a spin-cante d moment. A critical exponent, beta, equal to 0.380(5) was obtained from a fit of the very low field remanent magnetization data to a power law. As th e de field is increased, the weak spontaneous magnetization continuously di minishes with respect to the total magnetization and the behavior typical o f an antiferromagnet appears. When the field is increased, furthermore, a t ransition from the antiferromagnetic to a spin-flop state is observed.