Effect of quadrupolar interactions on the magnetic transitions of the terbium-monopnictides
Effect of quadrupolar interactions on the magnetic transitions of the terbium-monopnictides
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四极相互作用对铽单硝化物磁转变的影响
DOI：
10.1007/bf01598754
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
G. Raffius
中科院分区：
文献类型：
--
作者：
J. Kötzler;G. Raffius
在平均场近似下，分析了单基态磁体TbP，TbAs，TbSb和TbBi在Neel温度以下的热力学性质.如果，除了磁相互作用，也四极-四极耦合之间的Tb 3+被考虑在内，自洽的计算描述的实验数据的自发偶极和四极矩和比热相当令人满意的高达TN。在一般的相图中，MFA的有效性可以追溯到四极耦合，将跃迁推到一阶或“几乎”一阶。从TbP到TbBi，观察到交换耦合的系统加强，这可能是由于传导电子。铁畸变四极相互作用，减少从TbP到TbBi，也占主导地位的交换相互作用。
The thermodynamic properties below the Neél temperatures of the single-groundstate magnets TbP, TbAs, TbSb and TbBi are analyzed within the mean-field approximation. If, in addition to the magnetic interaction, also quadrupole-quadrupole couplings between the Tb3+are taken into account, the self-consistent calculations describe experimental data on the spontaneous dipolar and quadrupolar moments and the specific heat quite satisfactorily up toTN. In a general phase diagram, the validity of the MFA is traced to the quadrupolar coupling, pushing the transitions to first or ‘almost’ first order. Going from TbP to TbBi, a systematic strengthening of the exchange coupling is observed which is probably due to the conduction electrons. The ferrodistortive quadrupolar interaction, decreasing from TbP to TbBi, is also dominated by exchange interactions.