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Your search keyword '"Lin, Shi-Yuan"' showing total 9 results
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9 results on '"Lin, Shi-Yuan"'

1. Theoretical search for half-Heusler topological insulators

Author

Lin, Shi-Yuan, Yang, Xiao-Bao, Zhao, Yu-Jun, Wu, Shu-Chun, Felser, Claudia, and Yan, Binghai

Subjects
Condensed Matter - Materials Science
Abstract

We have performed ab-initio band structure calculations on more than two thousand half-Heusler compounds in order to search for new candidates for topological insulators. Herein, LiAuS and NaAuS are found to be the strongest topological insulators with the bulk band gap of 0.20 and 0.19 eV, respectively, different from the zero band gap feature reported in other Heusler topological insulators. Due to the inversion asymmetry of the Heusler structure, their topological surface states on the top and bottom surfaces exhibit p-type and n-type carriers, respectively. Thus, these materials may serve as an ideal platform for the realization of topological magneto-electric effects as polar topological insulators. Moreover, these topological surface states exhibit the right-hand spin-texture in the upper Dirac cone, which distinguish them from currently known topological insulator materials. Their topological nontrivial character remains robust against in-plane strains, which makes them suitable for epitaxial growth of films., Comment: 18 pages and 7 figures

Published
2014
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4. Theoretical study of structural stabilities and magnetic properties of doped transition metals in MnTe vs ZnTe and CdTe: Reduced clustering trend and enhanced magnetic coupling.

Author

Wu, Jian-Ming, Chen, Xing-Yuan, Lin, Shi-Yuan, and Zhao, Yu-Jun

Subjects
TRANSITION metals, MAGNETIC properties, MAGNETIC coupling, ELECTROMAGNETISM, MAGNETIC fields
Abstract

Clustering and weak magnetic coupling of doped transition metals (TMs) have hampered the potential spintronic applications of many magnetic semiconductors. Here, the influence of the host crystal magnetic background on the magnetic coupling and clustering of TM impurities is studied theoretically, with a comparison of a series of TMs (V, Cr, Fe, Co, and Ni) in MnTe, ZnTe, and CdTe hosts. We found that the antiferromagnetic (AFM) background of MnTe degrades the clustering tendency of the studied TM impurities (except Ni). Meanwhile, the AFM background of MnTe significantly enhances the magnetic coupling of doped Fe, Co, and Ni pairs in general, either ferromagnetically (for Fe, Ni) or antiferromagnetically (for Co). The enhanced ferromagnetic coupling and weakened clustering of Fe impurities in MnTe imply that an AFM background of host semiconductors may aid the development of high TC magnetic semiconductors with intrinsic magnetism. [ABSTRACT FROM AUTHOR]

Published
2013
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8. Theoretical study of magnetic phase transitions of cubic SrMnO3 under physical and chemical pressures.

Author

Chen, Xing-Yuan, Zhu, Wei-ling, Lin, Shi-Yuan, and Zhao, Yu-Jun

Subjects
*MAGNETIC transitions, *STRONTIUM compounds, *CHEMICAL kinetics, *ATOMIC force microscopy, *DOPING agents (Chemistry), *CHEMICAL processes
Abstract

Highlights: [•] Rich phase transitions were predicted in SrMnO3 under negative pressures. [•] The required negative pressure could be reduced by doping with ions of larger radii. [•] The G-AFM configuration of cubic SrMnO3 could be destabilized, in line with experiments. [ABSTRACT FROM AUTHOR]

Published
2014
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9. [Preparation of Shuxiong pulsatile controlled-release dropping pill].

Author

Chen H, Chen YZ, Xie QC, Lin SY, Lin JC, and Jianc WN

Subjects
Carboxymethylcellulose Sodium chemistry, Cellulose analogs & derivatives, Cellulose chemistry, Drugs, Chinese Herbal chemistry, Drugs, Chinese Herbal pharmacokinetics, Hydrogen-Ion Concentration, Plants, Medicinal chemistry, Povidone chemistry, Saponins analysis, Tablets, Delayed-Action Preparations chemistry, Drug Compounding methods, Drugs, Chinese Herbal administration & dosage
Abstract

Objective: To prepare Shuxiong pulsatile controlled-release dropping pill and study the influencing factors in vitro., Methods: Dropping pills with suitable size (10 - 15 mg) were coated with swelling layer containing croscarmellose sodium and controlled-release layer containing ethylcellulos aqueous dispersion respectively to prepare Shuxiong pulsatile controlled-release dropping pill. The effects of the materials of swelling layer, the weight of swelling layer and controlled-release layer on the release of drugs were investigated to optimize the process technology and validate formula., Results: The release behavior was influenced strikingly by the types and weight of coating layer. The optimal formula was as follows: Shuxiong pulsatile controlled-release dropping pills were prepared using croscarmellose sodium as inner layer with 15% (weight) coating level and ethylcellulose aqueous dispersion (Surelease) as outer controlled-release layer with 7% (weight) coating level. The lag time of prepared pulsatile controlled-release dropping pills was about 4 h and accumulative release rate reached 80% within 4 h., Conclusion: The drug release of Shuxiong pulsatile controlled-release dropping pill is shown in pulsatile way in vitro.

Published
2013

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