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Strong Magnetic Field Effect on Spin Fluctuations in Wealkl and Nearly Ferromagnetic Materials.

强磁场对弱铁磁材料自旋涨落的影响。

基本信息

批准号：
61550471
负责人：
IKEDA Koki
金额：
$ 1.34万
依托单位：
Iwate University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

The quenching of spin fluctuations by magnetic fields has been observed in the heat-capacity and electrical-resistivity measurements at low temperatures for a series of weakly and nearly ferromagnetic materials. In the weak ininerant-electron ferromagnetic Sc_3In vonysininh 24.1, 24.3 and 24.4 at.% In, the heat-capacity peak and the resistivity bulge at the Curie temperature in zero field, Tc(0), becomes smaller with increasing magnetic fields and at 10 T the magnetic entropies are only 11 to 19% of the zero-field value. By assuming that the characteristic spin-fluctuation temperature is equal to Tc(0), the experimental results in Sc_<>In were systematically analyzed in terms of the quenching of spin fluctuations by magnetic fields. The low temperature (1-20K) heat capacity was measured in magnetic fields up to 10 T for several highly-enhanced paramagnets. In the RCo_2 (R=Sc, Y or Lu) compounds, the dilute Pd-Ni alloys containing 0.47 and 0.97 at.% Ni, and the mixed-valent CeSn_3 compound, the electronic specific-heat constant, <gamma>, decreases with increasing fields (by 7%, 4%, 10%, 12%, 13%, and 28%, respectively, at 10 T). This is probably due to the depression of the spin-fluctuation enhancement by magnetic fields and is in accord with the recent theoretical prediction

在一系列弱铁磁和近铁磁材料的低温热容和电阻率测量中，观察到磁场对自旋涨落的猝灭。在弱惰性电子铁磁Sc_3In vonysininh 24.1、24.3和24.4 at.% In中，零场居里温度下的热容峰值和电阻率凸起Tc(0)随着磁场的增加而变小，在10 T时磁熵仅为零场值的11%到19%。假设自旋涨落特征温度等于Tc(0)，从磁场猝灭自旋涨落的角度对Sc_<>In的实验结果进行了系统分析。在高达 10 T 的磁场中测量了几种高度增强的顺磁体的低温 (1-20K) 热容。在RCo_2（R=Sc、Y或Lu）化合物、含有0.47和0.97 at.% Ni的稀Pd-Ni合金以及混合价CeSn_3化合物中，电子比热常数<gamma>随着电场的增加而减小（在10 T下分别降低7%、4%、10%、12%、13%和28%）。这可能是由于磁场抑制了自旋涨落增强，并且与最近的理论预测一致