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arXiv 0902.0151cond-mat.str-elcond-mat.mtrl-sci
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Gd6Co1.67 Si 3和Tb6Co1.67 Si 3中的磁异常

Magnetic anomalies in Gd6Co1.67Si3 and Tb6Co1.67Si3

S. Narayana Jammalamadaka, Niharika Mohapatra, Sitikantha D Das, Kartik K Iyer, E. V. Sampathkumaran

摘要:

最近报道的化合物Gd_6Co_(1.67)Si_3和Tb_6Co_(1.67)Si_3是由Ce_6 Ni_2Si_3衍生的六方结构(空间群:P_(6_3/ m)),在295和190 K以下磁性有序。重点是:在1.8 K下,随着H的增加,Tb化合物的M(H)曲线出现多个台阶,但这些台阶在H的逆循环中不出现。在更高的温度下,没有这样的步骤。然而,在任何温度下都没有观察到Gd化合物的M(H)的这种“阶梯”行为,并且等温磁化强度不像Tb化合物那样是滞后的。根据在近温度区间测量的M(H)数据,我们推导出了等温熵变(Δ S),发现Δ S遵循理论预测的H^2/3依赖性。

英文摘要:

The compounds, Gd6Co1.67Si3 and Tb6Co1.67Si3, recently reported to form in a Ce6Ni2Si3-derived hexagonal structure (space group: P6_3 / m) and to order magnetically below 295 and 190 K respectively, have been investigated by detailed magnetization (M) studies in the temperature interval 1.8-330 K as a function of magnetic field (H). The points of emphasis are: We observe multiple steps in the M(H) curve for the Tb compound at 1.8 K while increasing H, but these steps do not appear in the reverse cycle of H. At higher temperatures, such steps are absent. However, this 'staircase' behavior of M(H) is not observed for the Gd compound at any temperature and the isothermal magnetization is not hysteretic unlike in Tb compound. From the M(H) data measured at close intervals of temperature, we have derived isothermal entropy change (Delta S) and it is found that Delta S follows a theoretically predicted H^2/3-dependence.

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