替代CoMnSi异磁体的磁弹耦合和竞争熵变
Magneto-elastic coupling and competing entropy changes in substituted CoMnSi metamagnets
摘要：
我们使用中子衍射，磁强计和低温热容探测巨磁弹性耦合CoMnSi基反铁磁体，并建立在这样的化合物的变磁转变发生的熵变的起源。我们发现反铁磁和高磁化状态的电子态密度之间有很大的差异。磁场引起的熵变是由这种贡献和一个显着的抵消晶格成分，推导出从存在的负磁致伸缩。在计算电子熵变时，我们注意到使用精确的电子态密度模型的重要性，这里的电子态密度在费米能附近迅速变化。
英文摘要：
We use neutron diffraction, magnetometry and low temperature heat capacity to probe giant magneto-elastic coupling in CoMnSi-based antiferromagnets and to establish the origin of the entropy change that occurs at the metamagnetic transition in such compounds. We find a large difference between the electronic density of states of the antiferromagnetic and high magnetisation states. The magnetic field-induced entropy change is composed of this contribution and a significant counteracting lattice component, deduced from the presence of negative magnetostriction. In calculating the electronic entropy change, we note the importance of using an accurate model of the electronic density of states, which here varies rapidly close to the Fermi energy.
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