GaAs中富Mn Mn（Ga）As纳米团簇的类自旋玻璃行为
Spin-glass-like behavior caused by Mn-rich Mn(Ga)As nanoclusters in GaAs
摘要：
我们用解析方法模拟了GaAs中富Mn的Mn（Ga）As纳米团簇之间的间接交换作用。与传统的Ruderman-Kittel-Kasuya-Yosida（RKKY）公式相比，该公式考虑了介质中载体的介导，我们还包括了簇内载体的贡献。由于簇中的载流子浓度较高，这种修改允许RKKY振荡改变符号。因此，虽然以前的方法只支持该系统的铁磁性，但反铁磁耦合实际上是可能的。由于富Mn的Mn（Ga）As纳米团簇是自然形成的，并且必然具有不同的尺寸，因此它们的自旋取向可能由于来自不同邻居的混合偏好而受到阻碍。我们认为，这可能是困扰这个系统的自旋玻璃样行为的来源。通过调整尺寸和缩小其分布，可以恢复正常的铁磁性，居里温度高于以前认为的。
英文摘要：
We simulate the indirect exchange interaction between Mn-rich Mn(Ga)As nanoclusters in GaAs by analytical means. In contrast to the conventional Ruderman-Kittel-Kasuya-Yosida (RKKY) formula which considers the mediation by the carriers in the medium, we also include the contribution from those inside the clusters. Since the carrier concentration is higher in the clusters, this modification allows the RKKY oscillation to change sign. Consequently, while the previous approach only favors ferromagnetism for this system, an antiferromagnetic coupling is in fact possible. Since the Mn-rich Mn(Ga)As nanoclusters are naturally formed and bound to have different sizes, their spin orientation is likely to be frustrated due to mixed preferences from different neighbors. We argue that this is likely the source of the spin-glass-like behavior which plagues this system. By tuning the size and narrowing its distribution, normal ferromagnetism can be restored with an Curie temperature higher than previously thought.
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