Abstract
1. Introduction
It is an everlasting dream to make electronic devices miniaturization, multi-functionalization, intellectualization, and low-power consumption in this current information society[
DMSs researches date back to the concentrated magnetic semiconductors compounds, like EuX[
It is of great fundamental significance and practical value to further improve TC of (Ga,Mn)As[
Figure 1.(Color online) The crystal structure of (a) “111” Li(Zn,Mn)As with zinc blende structure, (b) “122” (Ba,K)(Zn,Mn)2As2 with ThCr2Si2 type structure, (c) (Sr,Na)(Zn,Mn)2As2 with CaAl2Si2 type structure, (d) “1111” (Ba,K)F(Zn,Mn)As with ZrCuSiAs structure. Adoped from Refs. [
2. Polycrystals synthesis and basic physicial properties
2.1. “111” type DMSs
LiZnAs[
Figure 2.(Color online) Magnetization & transport measurements of Li(Zn,Mn)As. (a) The temperature dependence of
In order to examine volume fraction and the ordered moment size, μSR measurements were performed on sintered polycrystalline specimens of Li1.1(Zn0.95Mn0.05)As[
Figure 3.(Color online) Results of
The discovery of Li(Zn,Mn)As sparked extensive researches in this 111 type DMSs[
Figure 4.(Color online) (a)
Usually, the carriers are induced in Li site while spins in Zn site in all these above systems. Different from that idea, a new DMSs Li(Zn,Co,Mn)As[
2.2. “122” type DMSs
BaZn2As2 is a semiconductor synthetized at high temperature (>900 °C) with the tetragonal ThCr2Si2 crystal structure. A new type “122” DMSs (Ba,K)(Zn,Mn)2As2 has been synthesized with the Ba2+/K1+ substitution (hole carries) and Zn2+/Mn2+ (spins) doping. Fig. 5(a) shows the temperature dependence of M in H = 500 Oe for (Ba0.7K0.3)(Zn0.85Mn0.15)2As2 at ZFC and FC procedures with TC 230 K. The hysteresis curves M(H) are shown in the inset of Fig. 5(a). Fig. 5(b) exhibits the spontaneous magnetization curve under 5 Oe of (Ba0.7K0.3)- (Zn0.85Mn0.15)2As2, showing T3/2 dependence in low temperature, as expected for a homogeneous ferromagnet[
Figure 5.(Color online) Magnetization & transport measuremets of (Ba,K)(Zn,Mn) 2As2. (a) The tempertature dependence of
Different from (Ba,K)(Zn,Mn)2As2, another “122” type DMSs with hexagonal CaAl2Si2 was reported subsequently, such as (Ca,Na)(Zn,Mn)2As2[
Figure 6.(Color online) Magnetization & transport measurements of (Ca,Na)(Zn,Mn) 2As2, (Sr,Na)(Zn,Mn)2As2 and (Sr,Na)(Cd,Mn)2As2. (a) The temperature dependence of
2.3. “1111” type DMSs
Isostructural to the well-studied iron-based superconductor LaFeAs(O1–xFx)[
Figure 7.(Color online) (a) Field dependences of magnetization for (La0.95Ca0.05)(Zn0.9Mn0.1)SbO measured at 25 and 100 K. (b) resistivity of (La0.95Ca0.05)(Zn0.925Mn0.075)SbO in various external field
3. Properties of (Ba,K)(Zn,Mn)2As2
3.1. X ray absorption spectroscopy (XAS) & angle-resolved photoemission spectroscopy (ARPES)
The origin of magnetic ordering on DMSs is still full of debates[
Fig. 8(a) exhibits the X-ray absorption spectroscopy (XAS) measurements[
Figure 8.(Color online) (a) Mn
3.2. Single crystal growth and spin polarization measurements
Compared with polycrystals, single crystals are ideal research platforms due to fewer defects. (Ba,K)(Zn,Mn)2As2 single crystal[
Figure 9.(Color online) (a) The X-ray difraction patterns of (Ba0.904K0.096)(Zn0.805Mn0.195)2As2 at room temperature. The inset shows the crystal structure (right) and its photograph (lef). (b) The tempertature dependence of
Andreev refection spectroscopy (AR spectroscopy) is commonly used to achieve spin polarization (P) in various materials, e.g., (Ga,Mn)As[
Figure 10.(Color online) (a) Sketch of the (Ba0.904K0.096)(Zn0.805Mn0.195)2As2/Pb junctions used for Andreev refection spectroscopy. The inset is the normalization for the diferential conductance
Compared to classical DMSs, new type of DMSs has one great advantage, existence of numerous isostructual function materials. As shown in Fig. 11, (Ba,K)(Zn,Mn)2As2 shares the same tetragonal ThCr2Si2 type structure with semiconductor BaZn2As2, antiferromagnetic BaMn2As2[
Figure 11.(colour online) Crystal structures and key physical propertity of (Ba,K)(Zn,Mn)2As2, BaMn2As2, BaZn2As2 and (Ba,K)Fe2As2.
4. Summary and outlook
There are three main group of new diluted magnetic semiconductors with independent charge and spin doping, i.e. the “111”, “122” and “1111” type, as listed in Table 1. BZA is unique in that it has TC above 200 K. Note that there are other four DMSs which are isostructural to BZA but have low TC. What makes BZA so special is one open question. The accurate answer to the question could be the clue to seek mechanism of DMSs and the guiding light to search for room temperature ferromagnetic DMSs.
Taking the advantage of lattice matched superconductors, semiconductors and antiferromagnetic compounds, these new types of DMSs have potential to fabricate multilayer heterojunctions[
Acknowledgment
We would like to thank the collaborators Prof. Y. J. Uemura, Prof. Yong Qing Li, Prof. A. Fujimori, Prof. S. Maekawa, Prof. Bo Gu, Prof. Lixin Cao, et al. We are grateful to Prof. L. Yu, F. C. Zhang, J. H. Zhao and F. L. Ning for the helpful discussions. This work is financially supported by Ministry of Science and Technology of China (Nos. 2018YFA03057001, and 2017YFB0405703), National Natural Science Foundation of China through the research projects (No. 11534016).
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