M. Yoshida , H. Arima , Y. Watanabe , A. Yamashita , Y. Mizuguchi
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引用次数: 0
摘要
应用磁场进行热切换是电子设备热管理的关键技术之一。在低温器件中，超导体可用作磁热开关（MTS）材料，因为超导转变会使载流子热导率发生很大变化。在这项研究中，我们测量了 Sn、Ta 和 V 的热导率（κ）的温度（T）和磁场（H）相关性，以丰富对Ⅰ型和Ⅱ型超导体的磁热开关知识。通过数据分析，我们发现Ⅰ型超导体和Ⅱ型超导体的κ-H 曲线呈现出不同的趋势。Ⅰ型超导体的归一化κ-H 曲线表现出相似的行为，即完全受 Hc 的支配。然而，Ⅱ型超导体的κ-H 曲线受到 Hc1 和 Hc2 的影响，其行为在很大程度上取决于材料。此外，我们还研究了 Sn 和 Ta 的元素组成，以探索κ-H 曲线中弱磁滞的起源，并揭示了杂质对κ-H 曲线磁滞的重要性。
Magneto-thermal-switching in type-I and type-II superconductors
Thermal switching by applying magnetic field is one of the key technologies in thermal management in electronic devices. In low-temperature devices, superconductors can be used as a magneto-thermal-switching (MTS) materials due to the large change in carrier thermal conductivity by the superconducting transition. In this study, we measured the temperature (T) and magnetic field (H) dependences of thermal conductivity (κ) of Sn, Ta and V to enrich knowledge on MTS of type-Ⅰ and type-Ⅱ superconductors. From the data analyses, we found different trends of κ-H curves in type-Ⅰ and type-Ⅱ superconductors. The normalized κ-H curves of type-Ⅰ superconductors showed the similar behavior, which is solely governed by Hc. However, the κ-H curves of type-Ⅱ superconductors were affected by the Hc1 and Hc2, and its behavior greatly depends on the materials. In addition, we investigated the elemental composition of Sn and Ta to explore the origin of weak hysteresis in the κ-H curves and revealed the importance of impurity on the hysteresis of κ-H curves.
期刊介绍：
Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity.
The main goal of the journal is to publish:
1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods.
2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance.
3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices.
The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.
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