Physics – Condensed Matter – Materials Science
Scientific paper
2001-04-25
Phys. Rev. B 63, 054431 (2001)
Physics
Condensed Matter
Materials Science
Revtex, 6 figures
Scientific paper
10.1103/PhysRevB.63.054431
An unusual field dependent slow magnetic relaxation and two distinct transitions were observed in a family of new rare earth-transition metal complexes, [Ln (bipy) (H$_{2}$O)$_{4}$ M(CN)$_{6}$] $\cdot $1.5 (bipy) $ \cdot $ 4H$_{2}$O (bipy = 2,2'-bipyridine; Ln = Gd$^{3+}$,Y$^{3+}$; M = Fe$ ^{3+}$, Co$^{3+}$). The novel magnetic relaxation, which is quite different from those in normal spin glasses and superparamagnets but very resembles qualitatively those in single-molecule magnet Mn$_{12}$-Ac even if they possess different structures, might be attributed to the presence of frustration that is incrementally unveiled by the external magnetic field. The two distinct transitions in [GdFe] were presumed from DC and AC susceptibility as well as heat capacity measurements.
Gao Song
Ma Bao-Qing
Su Gang
Yi Tao
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