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| Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2 | |
| 2017-08-28 | |
| Source Publication | JOURNAL OF CHEMICAL PHYSICS
 |
| ISSN | 0021-9606 |
| Volume | 147Issue:8 |
| Status | 已发表 |
| DOI | 10.1063/1.4999467 |
| Abstract | Cd3As2 is a Dirac semimetal that is a 3D analog of graphene. We investigated the local structure and nuclear-spin dynamics in Cd3As2 via Cd-113 NMR. The wideline spectrum of the static sample at 295K is asymmetric and its features are well described by a two-site model with the shielding parameters extracted via Herzfeld-Berger analysis of the magic-angle spinning spectrum. Surprisingly, the Cd-113 spin-lattice relaxation time (T-1) is extremely long (T-1 = 95 s at 295 K), in stark contrast to conductors and the effects of native defects upon semiconductors; but it is similar to that of C-13 in graphene (T-1 = 110 s). The temperature dependence of 1/T-1 revealed a complex bipartite mechanism that included a T-2 power-law behavior below 330 K and a thermally activated process above 330 K. In the high-temperature regime, the Arrhenius behavior is consistent with a field-dependent Cd atomic hopping relaxation process. At low temperatures, a T-2 behavior consistent with a spin-1/2 Raman-like process provides evidence of a time-dependent spin-rotation magnetic field caused by angular oscillations of internuclear vectors due to lattice vibrations. The observed mechanism does not conform to the conventional two-band model of semimetals, but is instead closer to a mechanism observed in high-Z element ionic solids with large magnetorotation constant [A.J. Vega et al., Phys. Rev. B 74, 214420 (2006)/. Published by AIP Publishing. |
| Indexed By | SCI ; EI |
| Language | 英语 |
| Funding Project | MRI program of the National Science Foundation[1532232] |
| WOS Research Area | Chemistry ; Physics |
| WOS Subject | Chemistry, Physical ; Physics, Atomic, Molecular & Chemical |
| WOS ID | WOS:000409143100036 |
| Publisher | AMER INST PHYSICS |
| EI Accession Number | 20173604116118 |
| EI Keywords | Graphene ; Lattice vibrations ; Magic angle spinning ; Metalloids ; Narrow band gap semiconductors ; Nuclear magnetic resonance ; Temperature distribution |
| EI Classification Number | Thermodynamics:641.1 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Atomic and Molecular Physics:931.3 ; Crystal Lattice:933.1.1 |
| WOS Keyword | BAND-STRUCTURE ; SOLID-STATE ; NMR ; CONDUCTION ; CRYSTAL |
| Original Document Type | Article |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/4645 |
| Collection | 物质科学与技术学院_PI研究组_Dimitrios Koumoulis组 |
| Corresponding Author | Koumoulis, Dimitrios; Bouchard, Louis-S. |
| Affiliation | 1.Univ Calif Los Angeles, Dept Chem & Biochem, 607 Charles E Young Dr East, Los Angeles, CA 90095 USA 2.Univ Calif Los Angeles, Dept Bioengn, 420 Westwood Plaza, Los Angeles, CA 90095 USA 3.Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA 4.Univ Calif Los Angeles, Calif NanoSyst Inst, 570 Westwood Plaza, Los Angeles, CA 90095 USA 5.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China |
| First Author Affilication | School of Physical Science and Technology |
| Corresponding Author Affilication | School of Physical Science and Technology |
| Recommended Citation GB/T 7714 | Koumoulis, Dimitrios,Taylor, Robert E.,McCormick, Jeffrey,et al. Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2[J]. JOURNAL OF CHEMICAL PHYSICS,2017,147(8). |
| APA | Koumoulis, Dimitrios.,Taylor, Robert E..,McCormick, Jeffrey.,Ertas, Yavuz N..,Pan, Lei.,...&Bouchard, Louis-S..(2017).Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2.JOURNAL OF CHEMICAL PHYSICS,147(8). |
| MLA | Koumoulis, Dimitrios,et al."Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2".JOURNAL OF CHEMICAL PHYSICS 147.8(2017). |
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