Elastic properties of reentrant spin glass
Elastic properties of reentrant spin glass
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重入自旋玻璃的弹性性能
DOI：
10.1063/1.344621
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发表时间：
1990
影响因子：
3.2
通讯作者：
A. Raychaudhuri
中科院分区：
文献类型：
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作者：
P. K. Mukhopadhyay;A. Raychaudhuri
在1.5K-300K温度范围内，用振动簧片技术测量了Fe80−xNixCr20系列合金的杨氏模数(E)和声速(V)，测量范围为14≤x≤30。这种测量在很大的x和T范围内进行，使得研究和比较单一合金系列中从长程反铁磁体到长程铁磁体(FM)通过自旋玻璃(SG)和重入自旋玻璃(RSG)中间相的各种磁相变的弹性表现。在Fm和Rsg合金中，E和v的磁性贡献在性质上是相似的(均为正值)，并且当x→xC时，它趋于零，其中xC是开始铁磁性的临界镍浓度。在自旋玻璃(x<；xc)中，磁贡献是负的，在自旋玻璃转变附近出现最小值。还测量了外加磁场H(=0.02T)下的E随温度(T<；T_c)的变化，以研究铁磁和稀土合金中磁畴对E的贡献。
Young’s modulus (E) and the sound velocity (v) of the alloy series Fe80−xNixCr20 were measured using a vibrating reed technique for 14≤x≤30 in the temperature range 1.5–300 K. The measurement, done over a large range of x and T, made it possible to study and compare the elastic manifestation of various magnetic transitions in a single alloys series, from long‐range antiferromagnet (AFM) to long‐range ferromagnet (FM) through intermediate phases of spin glass (SG) and reentrant spin glass (RSG). The magnetic contribution to E and v is found to be qualitatively similar in FM and RSG alloys (both positive) and that it tends to zero as x→xc, where xc is the critical nickel concentration for the onset of ferromagnetism. In the spin glass (x<xc), the magnetic contribution is negative and shows a minimum near the spin‐glass transition. E has also been measured in an applied field H(=0.02 T) as a function of temperature (T<Tc) to study the contribution of magnetic domains to E in alloys with ferromagnetic and ree...