Low-temperature anomalous magnetic behavior of Co2TiO4 and Co2SnO4
Low-temperature anomalous magnetic behavior of Co2TiO4 and Co2SnO4
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DOI：
10.1063/1.4966172
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发表时间：
2016-10
影响因子：
3.2
通讯作者：
S. Nayak;K. Dasari;D. Joshi;P. Pramanik;R. Palai;A. Waske;R. N. Chauhan;N. Tiwari;T. Sarkar;S. Thota
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文献类型：
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作者：
S. Nayak;K. Dasari;D. Joshi;P. Pramanik;R. Palai;A. Waske;R. N. Chauhan;N. Tiwari;T. Sarkar;S. Thota
本文报道了铁磁尖晶石原钛酸钴（Co2 TiO 4）和原锡酸钴（Co2 SnO 4）的低温反常磁行为，前者在31.74K范围内表现出磁补偿行为，后者表现出两个连续的磁转变，即（i）铁磁到顺磁的转变（Neel温度TN = 41 K）和重入自旋玻璃行为（玻璃化转变温度TSG = 39 K）. Arrott图（H/M对M2）标准已被用来摆脱顺序的磁性转变发生在TN以下。在32 K以下，Arrott曲线的负斜率、M-H等温线的类变磁性、比热（CP T−1对T）在15 K以下的异常以及等温磁熵变（ΔS）的零交叉表明在5 K ≤ T ≤ 32 K的低温区存在伪一级不连续磁相变。Co2 TiO 4和Co2 SnO 4的直流和交流磁化率都用冻结自旋团簇来解释.
We report the low-temperature anomalous magnetic behavior of ferrimagnetic spinels cobalt orthotitanate (Co2TiO4), which exhibits magnetic compensation behavior across 31.74 K, and cobalt orthostannate (Co2SnO4) exhibiting two sequential magnetic transitions, namely (i) ferrimagnetic to paramagnetic transition with Neel temperature TN ∼ 41 K and reentrant spin-glass behavior with glass transition temperature TSG ∼ 39 K. The Arrott plot (H/M versus M2) criterion has been used to extricate the order of sequential magnetic transitions occurring below TN. Negative slopes of the Arrott plots below 32 K, metamagnetic-like character of the M-H isotherms, anomalies in the specific-heat (CP T−1 versus T) below 15 K, and a zero-crossover of isothermal magnetic-entropy-change (ΔS) signify the presence of pseudo first-order discontinuous magnetic phase transition in the low-temperature regime 5 K ≤ T ≤ 32 K. The dc- and ac-susceptibilities of both Co2TiO4 and Co2SnO4 are interpreted in terms of frozen-spin-clusters, ...