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標題: Neutron diffraction and specific heat studies on the magnetic ordering in the Fe-II(Delta)Fe-II(Lambda)(ox)(2)(Phen)(2) (n) molecular magnet
作者: Ho, C.J.
Her, J.L.
Sun, C.P.
Yang, C.C.
Huang, C.L.
Chou, C.C.
Li, L.L.
Lin, K.J.
Li, W.H.
Lynn, J.W.
Yang, H.D.
關鍵字: bimetallic chain systems;high-spin molecules;crystal-structure;rational route;ground-state;complex;relaxation;susceptibility;temperature;compound
Project: Physical Review B
期刊/報告no:: Physical Review B, Volume 76, Issue 22.
The magnetic characteristics of the molecular magnet [Fe-II(Delta)Fe-II(Lambda)(ox)(2)(Phen)(2)](n), having chemical formula C28H16Fe2N4O8 for unity, has been studied by magnetization, neutron diffraction, and field-dependent specific heat-measurements. In the high-temperature regime (T>T-m), the one-dimensional Ising chain model with alternate Lande factors is applied to describe its quasiferrimagnetic behavior as temperature approaches T-m. In the low-temperature region (T < T-m), the increase of interchain interactions gives rise to long-range magnetic ordering as indicated by an anomaly in specific heat. Furthermore, an intrinsic antiparallel alignment of spins with a net ferrimagnetic structure is deduced from neutron diffraction study. The field-dependent lambda-type anomaly of specific heat indicates that applying a magnetic field raises magnetic ordering temperature. An additional small anomaly in specific heat is also seen below T-m, which could be due to the zero-field splitting caused by the internal crystal field.
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.76.224417
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