稀释铁磁半导体Li1 +y（Zn1-xMnx）P中TC的研究及过掺杂Li对TC的抑制
MuSR Investigation and Suppression of TC by overdoped Li in Diluted Ferromagnetic Semiconductor Li1+y(Zn1-xMnx)P
摘要：
利用μ子自旋弛豫（muSR）方法研究了体相稀磁半导体（DFS）Li 1.15（Zn 0.9Mn 0.1）P（T_C ~ 22 K）的磁性. MuSR结果证实了在低于T_C时铁磁有序的逐渐发展，磁有序体积接近100%。尽管它的低载流子密度，静态内场和居里温度之间的关系观察到的Li（Zn，Mn）P是一致的趋势发现（Ga，Mn）As和其他散装DFS，表明这些系统共享一个共同的机制的铁磁交换相互作用。Li 1 +y（Zn 1-xMnx）P具有载流子和自旋掺杂解耦的优点，其中Mn 2+取代Zn 2+引入自旋，Li+非化学计量提供载流子。这一优势使我们能够研究过掺杂Li对铁磁有序态的影响。过掺杂Li抑制了一定自旋量的T_C和饱和磁矩，表明更多的载流子不利于铁磁交换作用，要获得最高的T_C，需要在电荷密度和自旋密度之间保持微妙的平衡。
英文摘要：
We use muon spin relaxation (muSR) to investigate the magnetic properties of a bulk form diluted ferromagnetic semiconductor (DFS) Li1.15(Zn0.9Mn0.1)P with T_C ~ 22 K. MuSR results confirm the gradual development of ferromagnetic ordering below T_C with a nearly 100% magnetic ordered volume. Despite its low carrier density, the relation between static internal field and Curie temperature observed for Li(Zn,Mn)P is consistent with the trend found in (Ga,Mn)As and other bulk DFSs, indicating these systems share a common mechanism for the ferromagnetic exchange interaction. Li1+y(Zn1-xMnx)P has the advantage of decoupled carrier and spin doping, where Mn2+ substitution for Zn2+ introduces spins and Li+ off-stoichiometry provides carriers. This advantage enables us to investigate the influence of overdoped Li on the ferromagnetic ordered state. Overdoping Li suppresses both T_C and saturation moments for a certain amount of spins, which indicates that more carriers are detrimental to the ferromagnetic exchange interaction, and that a delicate balance between charge and spin densities is required to achieve highest T_C.
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