Coupling between antiferromagnetic and spin-glass orders in the quasi-one-dimensional iron telluride TaFe1+xTe3 ( x=0.25 )
Coupling between antiferromagnetic and spin-glass orders in the quasi-one-dimensional iron telluride TaFe1+xTe3 ( x=0.25 )
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DOI：
10.1103/physrevb.104.104418
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发表时间：
2021-09
影响因子：
3.7
通讯作者：
Y. Liu;J. J. Bao-J.;C. Xu;W. Jiao;H. Zhang;L. C. Xu;Zengwei Zhu;H. Yang;Yonghui Zhou;Z. Ren;P. Biswas;S. Ghosh;Zhaorong Yang;X. Ke;G. Cao;Xiaofeng Xu
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文献类型：
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作者：
Y. Liu;J. J. Bao-J.;C. Xu;W. Jiao;H. Zhang;L. C. Xu;Zengwei Zhu;H. Yang;Yonghui Zhou;Z. Ren;P. Biswas;S. Ghosh;Zhaorong Yang;X. Ke;G. Cao;Xiaofeng Xu
理解不同磁交换相互作用之间的相互作用及其物理后果，特别是在存在巡回电子和无序的情况下，仍然是凝聚态物理学的中心主题之一。在这种情况下，反铁磁和自旋玻璃序之间的耦合可能会导致大的交换偏置，这是一个潜在的广泛技术应用的属性。本文报道了准一维铁碲化物TaFe $1 +x $Te $3 $（$x$=0.25）中反铁磁有序和自旋玻璃行为的共存。它的反铁磁性被认为是由于铁磁排列的FeTe链之间沿沿着$B$-轴的反铁磁链间耦合引起的，而自旋玻璃态则源于无序的Fe晶体。链和间隙亚晶格的这种二分作用是负责在低温下观察到的大交换偏置，与间隙Fe作为未补偿的时刻，其相邻的Fe链提供源，其钉扎。因此，这种铁基碲化物可以代表一种新的范式来研究过渡金属硫族化物的大家族，其磁序甚至维度可以在很大程度上被调谐，形成一个肥沃的操场来操纵或切换其自旋自由度。
Understanding the interplay among different magnetic exchange interactions and its physical consequences, especially in the presence of itinerant electrons and disorders, remains one of the central themes in condensed matter physics. In this vein, the coupling between antiferromagnetic and spin glass orders may lead to large exchange bias, a property of potential broad technological applications. In this article, we report the coexistence of antiferromagnetic order and spin glass behaviors in a quasi-one-dimensional iron telluride TaFe$_{1+x}$Te$_3$ ($x$=0.25). Its antiferromagnetism is believed to arise from the antiferromagnetic interchain coupling between the ferromagnetically aligned FeTe chains along the $b$-axis, while the spin glassy state stems from the disordered Fe interstitials. This dichotomic role of chain and interstitial sublattices is responsible for the large exchange bias observed at low temperatures, with the interstitial Fe acting as the uncompensated moment and its neighboring Fe chain providing the source for its pinning. This iron-based telluride may thereby represent a new paradigm to study the large family of transition metal chalcogenides whose magnetic order or even the dimensionality can be tuned to a large extent, forming a fertile playground to manipulate or switch the spin degrees of freedom thereof.