Der-Chung Yan

Comprehensive research facility for negative ion source neutral beam injection at CRAFT: design and first operation

Jianglong Wei, Yahong Xie, Yuanlai Xie, Caichao Jiang et autres

Abstract Neutral beam injection (NBI) has been proven as a reliable heating and current drive method for fusion plasma. For the high-energy NBI system (particle energy > 150 keV) of large-scale fusion devices, the negative ion source neutral beam injection (NNBI) system …

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Local structure and magnetic properties of ferromagnetic GaMnAs made by helium ion induced epitaxial crystallization annealing

C.H. Chen, Huan Niu, Der-Chung Yan, H. H. Hsieh et autres

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Enhancement of Ferromagnetism in CeO2 Nanoparticles by Nonmagnetic Cr3+ Doping

Shih‐Yun Chen, Kong-Wei Fong, Tung-Tse Peng, Chung‐Li Dong et autres

This study presents the effect of Cr 3+ on the formation of ferromagnetism in Cr-doped CeO 2 nanoparticles (NPs). Systematic synchrotron X-ray spectroscopy analysis was utilized to investigate the defects in CeO 2 NPs. X-ray absorption spectrum (XAS) revealed that the magnetic …

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Enhancement of superconductivity in FeSe 1− x Te x by Li doping

Chia‐Ming Yang, Po‐Wei Chen, In‐Gann Chen, Xiaoding Qi et autres

The study investigated the chemical doping effect of Li in the Fe(Se,Te) system. With the addition of Li, the NiAs phase was precipitated, which resulted in worse superconductivity in FeSe samples. The XRD results indicated that chemical stress was found in the …

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Ferromagnetic GeMn thin film prepared by ion implantation and ion beam induced epitaxial crystallization annealing

C. H. Chen, Hongsheng Niu, Der-Chung Yan, H. H. Hsieh et autres

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation C. H. Chen, H. Niu, D. C. Yan, H. …

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Concentration Dependence of Oxygen Vacancy on the Magnetism of CeO2 Nanoparticles

Shih‐Yun Chen, Chi‐Hang Tsai, Mei-Zi Huang, Der-Chung Yan et autres

This investigation demonstrates a strong dependence of the magnetism of CeO 2 nanoparticles on the concentration of oxygen vacancies. A strong magnetic signal is over for a narrow range (0.1 < Ce 3+ /Ce < 0.2) of Ce 3+ concentrations in the …

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Erratum: “Ferromagnetism of double-walled carbon nanotubes” [Appl. Phys. Lett. 96, 242503 (2010)]

Der-Chung Yan, Shih-Yun Chen, Maw‐Kuen Wu, C. C. et autres

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Oxygen Vacancy Dependent Magnetism of CeO2 Nanoparticles Prepared by Thermal Decomposition Method

Shih‐Yun Chen, Yi-Hsing Lu, Tzu-Wen Huang, Der-Chung Yan et autres

This study reports that highly oxygen-deficient CeO 2 nanoparticles (NPs) can be obtained without reduction treatment by using thermal decomposition method. Different amounts of surfactants are used to control the size of the NPs. The X-ray absorption near-edge spectra (XANES) indicate that …

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Ferromagnetism of double-walled carbon nanotubes

Der-Chung Yan, Shih-Yun Chen, Maw‐Kuen Wu, C. C. et autres

The pure double-walled carbon nanotubes (DWNTs) and two endohedral DWNTs (DWNTs with materials filled inside) are produced. The filling materials are CoI2 and KI, respectively. The ferromagnetism (FM) is observed in pure DWNTs. The content of residual catalyst Fe is too small …

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Growth and Investigation of Crystals of the New Superconductor α-FeSe from KCl Solutions

B. H. Mok, S. M. Rao, Minhua Ling, K. J. Wang et autres

Crystals of FeSe 0.88 and FeSeMn 0.1 have been grown from KCl solutions. Crystals measuring 2−3 mm across and 0.1−0.3 mm thick grow with a hexagonal plate like habit. Powder X-ray diffraction (XRD) measurements show strong peaks corresponding to the tetragonal α-FeSe …

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Fabrication of ferromagnetic (Ga,Mn)As by ion irradiation

C.H. Chen, Huan Niu, H. H. Hsieh, Chun-Yang Cheng et autres

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Tellurium substitution effect on superconductivity of the α-phase iron selenide

K. C. Yeh, Tzu-Wen Huang, Yi‐Lin Huang, Ta-Kun Chen et autres

We have carried out a systematic study of the PbO-type compound FeSe_{1-x}Te_x (x = 0~1), where Te substitution effect on superconductivity is investigated. It is found that superconducting transition temperature reaches a maximum of Tc=15.2K at about 50% Te substitution. The pressure-enhanced …

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