First-order valence transition of EuPd2Si2 induced by high magnetic fields
First-order valence transition of EuPd2Si2 induced by high magnetic fields
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高磁场诱导的 EuPd2Si2 的一级价态跃迁
DOI：
10.1143/jpsj.65.3471
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发表时间：
1996
影响因子：
1.7
通讯作者：
T. Goto
中科院分区：
文献类型：
--
作者：
H. Wada;A. Mitsuda;M. Shiga;H. Katori;T. Goto
为了研究磁场对Eu中间价的影响，测量了EuPd2Si2和Eu（Pd0.95Pt0.05）2Si2在100T下的磁化强度.在强磁场下，两种样品都发生了一阶变磁转变。EuPd2Si2在6K时的跃迁场为93T。接近7µ B的饱和磁化强度表明，这种变磁性是场诱导的Eu离子从中间价态到二价态的价态跃迁。基于组态间涨落（ICF）模型，估算了Eu3+离子转变为Eu2+离子的激发能。还研究了EuPd2Si2变磁跃迁场的温度依赖性。
In order to study the magnetic field effects on the intermediate valence of the Eu system, magnetization was measured for EuPd 2 Si 2 and Eu(Pd 0.95 Pt 0.05 ) 2 Si 2 up to 100 T. A first-order metamagnetic transition was observed for both samples under high magnetic fields. The transition field is 93T for EuPd 2 Si 2 at 6 K. The saturation magnetization close to 7µ B indicates that this metamagnetism is a field-induced valence transition from an intermediate valence state to a divalent state of the Eu ion. Based on the interconfigurational fluctuation (ICF) model, the excitation energy to convert an Eu 3+ ion into Eu 2+ was estimated. Temperature dependence of the metamagnetic transition field of EuPd 2 Si 2 was also studied.