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Updated: Sep 9, 2025

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Published on: January 21, 2016

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超低温磁性制冷无机材料:从设计合成到无磁化制冷

Qiao-Fei Xu1, Ruo-Tong Wu1, La-Sheng Long1

  • 1Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

Accounts of chemical research
|August 29, 2025
PubMed
概括

研究人员开发了新的磁性制冷剂,以实现高磁变化 (-ΔSm) 和低排序温度 (T0). 这些新材料在量子计算和天文学中显著提升了无冷却到1克尔文以下.

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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