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arXiv 0908.1937cond-mat.dis-nncond-mat.stat-mech
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稀稀土金属间化合物中的平均场型伊辛自旋玻璃

Mean-field type Ising spin glass in a diluted rare-earth intermetallic compound

Y Tabata, K Matsuda, S Kanada, T Waki, H Nakamura, K Sato, K Kindo

摘要:

本文用直流和交流磁化测量方法研究了长程RKKY Ising自旋玻璃\dyyrusi的相变。静态非线性极化率$χ_{2}$表现出向$\Tg$ $=$ 1.925 K发散的行为,$γ$的指数为$=$ 1.08。交流磁化强度测量得到的特征弛豫时间$τ$也发散到相同的$\Tg$,在零静磁场下的指数为$zν$ $=$ 1.9。这些结果表明,自旋玻璃相变属于平均场普适类,其中$\gammaMF$和$\znuMF$的指数分别为1和2.在500 Oe的有限场中,我们观察到$τ$向$\Tg$ $=$ 1.412 K的发散,其指数为$zν$ $=$ 2.1,与零场中的发散十分相似.强有力地表明了在有限场中存在自旋玻璃相变和在长程Ising自旋玻璃\dyyrusi中存在复制对称性破缺。

英文摘要:

We have investigated a phase transition of a long-range RKKY Ising spin glass \dyyrusi by means of the dc and the ac magnetization measurements. The static nonlinear susceptibility $χ_{2}$ exhibits a divergent behavior toward $\Tg$ $=$ 1.925 K with the exponent of $γ$ $=$ 1.08. The characteristic relaxation time $τ$ obtained from the ac magnetization measurements also diverges to the same $\Tg$ with the exponent of $zν$ $=$ 1.9 in zero static field . These results indicate the spin glass phase transition belonging to the mean-field universality class, in which the exponents of $\gammaMF$ and $\znuMF$ are 1 and 2 respectively. Moreover, we observed the divergence of $τ$ in a finite field of 500 Oe toward $\Tg$ $=$ 1.412 K with the exponent of $zν$ $=$ 2.1, being quite similar to that in zero field. It strongly suggests an existence of the spin glass phase transition in a finite field and the replica symmetry breaking (RSB) in the long-range Ising spin glass \dyyrusi.

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