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稀磁半导体兼具半导体材料和磁性材料的双重特性, 是破解摩尔定律难题的方案之一. 我们团队通过提出自旋和电荷分别掺杂的机制, 研制发现了一类新型稀磁半导体材料, 为突破经典稀磁半导体材料自旋和电荷一体掺杂引起的材料制备瓶颈提供了有效解决方案. (Ba,K)(Zn,Mn)2As2(BZA)等新型稀磁半导体通过等价掺杂磁性离子引入自旋、异价非磁性离子掺杂引入电荷, 实现了230 K的居里温度, 刷新了可控型稀磁半导体的居里温度记录. 本文重点介绍1)几种代表性的自旋和电荷掺杂机制分离的新型稀磁半导体的发现与研制; 2)新型稀磁半导体的μ子自旋弛豫与高压物性结构的调控; 3)大尺寸单晶生长、基于单晶的安德烈夫异质结研制以及自旋极化率的测量. 通过新材料设计研制、综合物性研究、简单原型器件构建的“全链条”模式研究, 开拓了自旋电荷分别掺杂的稀磁半导体材料研究领域, 展现了这类新型稀磁半导体材料潜在的光明前景.Due to the potential applications for spintronics devices, diluted ferromagnetic semiconductors (DMS) have received extensive attention for decades. However, in classical Ⅲ–Ⅴ based DMS material, such as (Ga,Mn)As, heterovalent (Ga3+, Mn2+) doping results in lack of individual control of carrier and spin doping, and seriously limited chemical solubility. The two difficulties prevent furtherincrease of the Curie temperature of the Ⅲ–Ⅴ based DMS. To overcome these difficulties, a series of new types of DMS with independent spin and charge doping have been synthesized, such as Ⅰ–Ⅱ–Ⅴ based LiZnAs and Ⅱ–Ⅱ–Ⅴ based (Ba,K)(Zn,Mn)2As2. In these new materials, isovalent (Zn,Mn) substitution is only spin doping, while charge is independently doped by heterovalentsubstitution of non-magnetic elements. As a result (Ba,K)(Zn,Mn)2As2 obtains the reliable record of Curie temperature (230 K) among DMS in which ferromagnetic ordering is mediated by itinerate carriers. In this review, we summarize the recent development of the new DMS materials with following aspects: 1) the discovery and synthesis of several typical new DMS materials; 2) physical properties studies with muon spin relaxation and in-situ high pressure techniques; 3) single crystal growth, Andreev reflection junction based on single crystal and measurements of spin polarization.
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Keywords:
- newt type of diluted magnetic semiconductor /
- independent charge and spin doping /
- high Curie temperature /
- heterojunction based on single
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图 1 (a) (Ga,Mn)As的晶体结构, 其中Mn同时引入电荷和自旋; (b) Li(Zn,Mn)As的晶体结构, 其中Mn仅引入自旋, 电荷来自Li含量的变化[12]
Fig. 1. (a) Crystal structure of (Ga,Mn)As, in which dependent charge and spin doping by Mn2+ dopant; (b) crystal structure of Li(Zn,Mn)As, in which spin is doped by isovalent (Zn,Mn) substitution while charge is doped by controlling Li concentration[12].
图 2 (a)不同Mn含量Li1.1(Zn,Mn)As的M(T)曲线; (b)不同Mn含量Li1.1(Zn,Mn)As的M(H)曲线, 其中灰色的磁滞回线对应了上方的横坐标; (c)样品Li1.1(Zn0.95Mn0.05)As在低温下的霍尔电阻, 15 K以下表现出了明显的反常霍尔效应[12]
Fig. 2. (a) Temperature dependence of magnetization of Li1.1(Zn1-xMnx)As; (b) field dependence of magnetization of Li1.1(Zn1-xMnx)As at various tempeartures; (c) Hall resistance of Li1.1(Zn0.95Mn0.05)As and the anomalous Hall effect below 15 K[12].
图 3 (a) BZA的晶体结构中, Mn引入自旋, K引入电荷; (b) Li(Zn,Mn)As中[Zn/MnAs4]四面体的间距; (c) BZA中[Zn/MnAs4]四面体的间距[17]
Fig. 3. (a) Crystal structure of BZA, in which spin is doped by isovalent (Zn,Mn) substitution while charge is doped by (Ba,K)substitution; (b) distance of nearest [Zn/MnAs4] tetrahedra (4.20 Å) in Li(Zn,Mn)As; (c) distance of nearest [Zn/MnAs4] tetrahedra (2.91 Å) in BZA[17].
图 4 (a)不同K, Mn含量(Ba,K)(Zn,Mn)2As2的ρ(T)曲线; (b)样品(Ba0.7K0.3)(Zn0.85Mn0.15)2As2的M(T)和M(H), M(T)中上升的拐点即为230 K的居里温度点; (c)样品(Ba0.85K0.15)(Zn0.9Mn0.1)2As2在低温下的霍尔电阻, 50 K以下表现出了明显的反常霍尔效应[17]
Fig. 4. (a) Temperature dependence of resistivity of (Ba,K)(Zn,Mn)2As2; (b) temperature dependence of magnetization and field dependence of magnetization (inset) of (Ba0.7K0.3)(Zn0.85Mn0.15)2As2, the upturn point, namely Curie temperature is 230 K; (c) Hall resistance of (Ba0.85K0.15)(Zn0.9Mn0.1)2As2 and the anomalous Hall effect below 50 K[17].
图 5 μSR测试结果汇总 (a) ZF模式下Li1.1(Zn0.95Mn0.05)As的时间谱; (b) ZF模式与WTF模式下Li1.1(Zn0.95Mn0.05)As铁磁含量的拟合结果, 两者互相吻合[12]; (c) ZF模式下(Ba0.80K0.20)(Zn0.9Mn0.1)2As2的时间谱; (d) ZF模式与WTF模式下(Ba0.80K0.20)(Zn0.9Mn0.1)2As2铁磁含量的拟合结果, 铁磁体积含量与SQUID的测量结果吻合[17]
Fig. 5. Results of muon spin relaxation measurements: (a) Time spectra of Li1.1(Zn0.95Mn0.05)As in ZF process; (b) the volume fraction of the magnetically ordered region in Li1.1(Zn0.95Mn0.05)As, derived from ZF and WTF spectra[12]; (c) time spectra of (Ba0.80K0.20)(Zn0.9Mn0.1)2As2 in ZF process; (d) the volume fraction of the magnetically ordered region in (Ba0.80K0.20)(Zn0.9Mn0.1)2As2, derived from ZF and WTF spectra[17].
图 6 (Ba0.75K0.25)(Zn0.95Mn0.05)2As2的高压表征 (a)常压下As的K边XAS和XMCD谱; (b) 2 K时高压原位的As-K边XMCD谱, 插图为XMCD谱的最高值随压力的变化; (c) 不同压力的电阻-温度曲线; (d)常温下XES谱随压力的演化, 插图为ΔE'随压力变化[26,34]
Fig. 6. In-situ high pressure properties of (Ba0.75K0.25)(Zn0.95Mn0.05)2As2: (a) As K-edge XAS near edge structure (black curve) and XMCD (blue curve) data takenat T = 2 K and ambient pressure; (b) pressure-dependent As K-edge XMCD signal, the inset is XMCD peak intensity normalized to unity at ambient pressure, dreen data points are compression data, while the red data point was obtained on decompression; (c) temperature-dependent resistance plots at various pressures; (d) X-ray emission spectra at high pressures and room temperature, the spectra were shifted in the vertical for clarity, red solid lines are fits using three Gaussian functions; left corner inset: energy difference ΔE'[26,34].
图 7 (Ba0.80K0.20)(Zn0.95Mn0.05)2As2的晶格常数随压力的变化, 左下角插图显示了ZnAs层间As-As距离, 右上角插图显示了MnAs4四面体内的As-Zn-As夹角α[34]
Fig. 7. Lattice parameters of (Ba0.80K0.20)(Zn0.95Mn0.05)2As2 as a function of pressure. Data were normalized to unity at ambient pressure. Left corner inset: crystal structure of (Ba,K)(Zn,Mn)2As2, and the pressure dependence of interlayer As-As distance d. Upper right corner inset: MnAs4 tetrahedron geometry, and the pressure dependence of As-Mn-As bond angle α in the MnAs4 tetrahedron[34].
图 9 (a) 2θ模式下BZA单晶的XRD谱, 插图为单晶照片以及晶体结构示意图; (b)沿不同方向测量的BZA单晶的M(T)曲线; (c)以BZA单晶为基础构造的安德烈夫反射结示意图[47]
Fig. 9. (a) XRD pattern of BZA single crystal with 2θ process, the insets are photographic of the single crystal and crystal structure of BZA; (b) temperature dependence of magnetization of the single crystal along ab-plane and c-axis; (c) sketch of the Andreev reflection junction based on BZA single crystal[47].
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