Spin-glass behavior and zero-field-cooled exchange bias in a Cr-based antiperovskite compound PdNCr3
Spin-glass behavior and zero-field-cooled exchange bias in a Cr-based antiperovskite compound PdNCr3
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Cr 基反钙钛矿化合物 PdNCr3 中的自旋玻璃行为和零场冷却交换偏压
DOI：
10.1039/c5tc00423c
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发表时间：
2015-05
影响因子：
6.4
通讯作者：
Sun, Y. P.
中科院分区：
文献类型：
--
作者：
Song, W. H.;Lu, W. J.;Tong, P.;Sun, Y. P.
本文报道了一种以mgcni3型立方结构结晶的cr基反钙钛矿化合物PdNCr3的合成、结构、磁性和电/热输运性质（空间群Pmm， No. 221）。有趣的是，PdNCr3的自旋玻璃（SG）行为得到了相应的特征参数(冻结温度T0 = 61.4(2) K，动力学指数zν = 7.103（3)，翻转时间τ0 = 2.714(2) × 10−11 s）的证实。此外，PdNCr3的Sommerfeld-Wilson比值（RW ~ 1.024(3)）远小于团簇玻璃体系（RW = 100）和Kondo团簇玻璃体系（RW = 20-30），表明PdNCr3是一个典型的SG体系。密度泛函理论计算表明，PdNCr3中SG的起源是由于N空位的无序分布，这一结论通过对缺氮较多的PdN0.75Cr3样品的测量得到进一步证实。另一方面，PdNCr3在非磁化状态下进行零场冷却后，很少观察到交换偏置场（HE）约为350 Oe的零场冷却交换偏置（ZFC-EB）。发现HE值与温度和测量磁场有很大关系。对于PdNCr3，在低于阻断温度的初始磁化过程中，在铁磁- sg界面周围等温形成了铁磁单向各向异性，这是ZFC-EB效应的起源。此外，在零场冷却过程中观察到ZFC-EB在PdNCr3中的训练效应，并用自旋构型弛豫模型很好地解释了这一效应。
We report the synthesis, structure, and magnetic and electrical/thermal transport properties of a Cr-based antiperovskite compound PdNCr3, which crystallizes in MgCNi3-type cubic structure (space group Pmm, No. 221). Interestingly, the spin-glass (SG) behavior, which is confirmed by the corresponding characteristic parameters (the freezing temperature T0 = 61.4(2) K, the dynamical exponent zν = 7.103(3), and the flipping time τ0 = 2.714(2) × 10−11 s), is observed in PdNCr3. Furthermore, the value of the Sommerfeld–Wilson ratio (RW ∼ 1.024(3)) for PdNCr3 is much smaller than those of cluster glass systems (RW > 100) and Kondo cluster glass systems (RW = 20–30), indicating that PdNCr3 is a canonical SG system. Density functional theory calculation shows that the origin of SG in PdNCr3 is attributed to the disordering located N vacancies, which is further confirmed by the measurement of sample PdN0.75Cr3 with more N deficiency. On the other hand, infrequently, the zero-field-cooled exchange bias (ZFC-EB) with an exchange bias field (HE) of about 350 Oe is observed after zero-field cooling from an unmagnetized state in PdNCr3. The values of HE are found to depend strongly on temperature and measuring magnetic field. For PdNCr3, the ferromagnetic unidirectional anisotropy, which is the origin of our ZFC-EB effect, is formed around the ferromagnetic–SG interface isothermally during the initial magnetization process below the blocking temperature. In addition, the training effect of ZFC-EB in PdNCr3 is observed after the zero-field cooling process and has been explained well in terms of the spin configurational relaxation model.
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DOI：
10.1083/jcb.1751iti5
发表时间：
2006-10-09
期刊：
The Journal of Cell Biology
影响因子：
--
作者：
Leslie M
通讯作者：
Leslie M
影响因子：
6.2
作者：
B. Wiendlocha;J. Toboła;S. Kaprzyk;D. Fruchart
通讯作者：
B. Wiendlocha;J. Toboła;S. Kaprzyk;D. Fruchart
影响因子：
4
作者：
Asano, K.;Koyama, K.;Takenaka, K.
通讯作者：
Takenaka, K.
影响因子：
1.7
作者：
FRUCHART, D;BERTAUT, EF
通讯作者：
BERTAUT, EF
影响因子：
1.7
作者：
D. Shao;W. Lu;P. Tong;S. Lin;J. Lin;Y. Sun
通讯作者：
D. Shao;W. Lu;P. Tong;S. Lin;J. Lin;Y. Sun