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arXiv 1306.4378cond-mat.mtrl-sci
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Cr掺杂变磁性DyAlO3的玻璃磁性

Glassy magnetic behavior in the metamagnetic DyAlO3 doped with Cr

R. Escudero, B. L. Ruiz-Herrera, M. P. Jimenez, F. Morales

摘要:

研究了DyAl $_{0.926}$ Cr $_{0.074}$ O $_3$和DyAl O $_3$的磁性。我们发现这两种化合物都是反铁磁的,具有较低的Néel转变温度。在较高的温度下,磁特性表现出居里-外斯依赖性。当外加约2 T的磁场时,Néel温度消失,系统由反铁磁转变为弱铁磁。此外,在不同频率下,Cr掺杂化合物中的AC磁性测量显示出类似自旋玻璃的行为。这些转变进行了研究,并证实了比热测量。我们发现在掺杂有铬的化合物中存在变磁性和自旋玻璃,确定少量铬原子的添加改变了化合物DyAlO $_3$的磁性,从而导致诸如自旋玻璃样行为的新特征。

英文摘要:

Magnetic properties of DyAl$_{0.926}$Cr$_{0.074}$O$_3$ and DyAlO$_3$ were studied. We found that both compounds are antiferromagnetic with a low Néel transition temperature. At higher temperatures the magnetic characteristics show a Curie-Weiss dependence. The Néel temperature disappears when a field of about 2 T is applied, the system changes from an antiferromagnetic to a weak ferromagnetic behavior due to a metamagnetic transition. Furthermore, AC magnetic measurements in the Cr doped compound, at different frequencies, show a spin glass-like behavior. These transitions were studied and corroborated by specific heat measurements. We found the presence of metamagnetism and spin glass in the compound doped with chromium, determining that the small addition of chromium atoms modifies the magnetic properties of the compound DyAlO$_3$, resulting in new features such as the spin glass-like behavior.

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