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首页> 外文期刊>Crystallography reports >Microscopic nature of the extremely high specific heat of rare earth intermetallic compounds at low temperatures and the possibility of its application in technical superconductivity
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Microscopic nature of the extremely high specific heat of rare earth intermetallic compounds at low temperatures and the possibility of its application in technical superconductivity

机译：稀土金属间化合物在低温下的极高比热的微观性质及其在技术超导中的应用可能性

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摘要

The presence of an unfilled f-electron shell in rare earth intermetallic compounds under conditions of strong electron correlation between localized and delocalized electrons is responsible for the formation of local magnetic moments. According to the data of neutron, synchrotron, and other investigations of a number of such systems, the interaction of these moments with the local crystalline environment, hybridization with conduction electrons, f-f correlations (i.e., both one-site and cooperative phenomena), and combinations of these main effects form the physical base for the reconstruction of the excitation spectrum of an f-electron system and appearance of pronounced specific features of thermodynamic characteristics. The range of characteristic temperatures of these anomalies is determined by the interaction energy, which generally corresponds to the range 1-100 K. For some intermetallic compounds, the additional component of the specific heat (of electron origin) may greatly (by two to three orders of magnitude) exceed the specific heat of conventional structural materials. This feature makes it possible to consider such systems as promising functional materials (a kind of thermodynamic dampers) capable of compensating, for various thermal perturbations in low-temperature superconducting magnetic systems.
机译：在局域电子和局域电子之间具有很强的电子相关性的条件下，稀土金属间化合物中存在未填充的f电子壳，这是局部磁矩形成的原因。根据中子，同步加速器和许多此类系统的其他研究数据，这些矩与局部晶体环境的相互作用，与传导电子的杂化，ff相关（即单点和协作现象）以及这些主要作用的组合形成了重建f电子系统激发光谱和出现明显的热力学特征的物理基础。这些异常的特征温度范围由相互作用能决定，该能量通常对应于1-100 K的范围。对于某些金属间化合物，（电子源的）比热的附加分量可能很大（由两到三倍）一个数量级）超过了常规结构材料的比热。该特征使得可以将这样的系统视为有希望的功能材料（一种热力学阻尼器），能够针对低温超导磁性系统中的各种热扰动进行补偿。

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