First explanation for mechanism behind magnetism-driven NTE derived in 40 years

ScienceDaily | 3/26/2019 | Staff
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Back in junior high or high school, many of us would have learned in science classes that materials expand upon heating and contract upon cooling. In reality, some materials behave the other way around, i.e. expanding upon cooling and vice-versa, an unusual phenomenon known as negative thermal expansion (NTE). NTE materials have thus come under the spotlight worldwide because by utilizing their characteristics and using them in combination with non-NTE materials, developers could make materials that are even less heat-sensitive than before. Unfortunately, the mechanism behind NTE had remained unknown to scientists and developers over the past 40 years.

However, for the first time, a recent study led by Professor Masahito Mochizuki at Waseda University and graduate student Masaya Kobayashi from Aoyama Gakuin University was able to provide a theoretical explanation to the NTE phenomenon by examining NTE observed in inverse perovskite antiferromagnets Mn3AN (A = Zn, Ga, etc.). The theory could not only help scientists and developers understand the mechanism behind NTE, but also allow them to predict and identify possible candidate materials that would exhibit NTE -- a crucial process in research and development.

Electron - Momentum - Spin - Rotation - Cooling

An electron has an angular momentum called "spin" originating from its rotation. During cooling, the spin vectors of electrons that orbit around the manganese (Mn) ion present in Mn3AN would...
(Excerpt) Read more at: ScienceDaily
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