Study of the magnetic phase transition in a cyanide-bridged molecule-based material:: [Mn(cyclam)][Fe(CN)6]•3H2O (cyclam=1,4,8,11-tetraazacyclotetradecane)

被引：23

作者：

Bhattacharjee, A

Miyazaki, Y

Nakazawa, Y

Koner, S

Iijima, S

Sorai, M

机构：

[1] Osaka Univ, Grad Sch Sci, Res Ctr Mol Thermodynam, Toyonaka, Osaka 5600043, Japan

[2] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058566, Japan

来源：

PHYSICA B | 2001年 / 305卷 / 01期

基金：

日本学术振兴会;

关键词：

molecule-based material; cyano ligand; heat capacity; magnetic phase transition; metamagnetism;

D O I：

10.1016/S0921-4526(01)00586-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Heat capacities of [Mn(cyclam)][Fe(CN)(6)] . 3H(2)O (cyclam = 1,4,8,11-tetraazacyclotetradecane) under zero magnetic field in the 0.1-300 K range were studied by adiabatic calorimetry. A heat capacity anomaly corresponding to the magnetic phase transition was detected at 6.2 K. The observed entropy gain (DeltaS = 2.32R) is in good agreement with the theoretical magnetic entropy (R In 5 x 2 = 2.3R) considering the spin multiplicity of high spin trivalent Mn and low spin trivalent Fe ions. Attempts have been made to interpret the low temperature heat capacity data in terms of the spin-wave theory. Possible magnetic interaction mechanism is discussed by comparing with those of related compounds. Heat capacity studies under applied magnetic fields indicated an anti ferromagnetic to ferromagnetic transition. A field dependence study of magnetization at different temperatures revealed a field-induced metamagnetic transition. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：56 / 64

页数：9

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