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Low-energy(40 keV) proton irradiation of YBa_2Cu_3O_(7-x) thin films:Micro-Raman characterization and electrical transport properties
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作者 San-Sheng Wang Fang Li +8 位作者 Han Wu Yu Zhang Suleman Muhammad Peng Zhao xiao-Yun Le zhi-song xiao Li-Xiang Jiang Xue-Dong Ou xiao-Ping Ouyang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第2期406-413,共8页
To investigate the damage profiles of high-fluence low-energy proton irradiation on superconducting materials and related devices, Raman characterization and electrical transport measurement of 40-keV-proton irradiate... To investigate the damage profiles of high-fluence low-energy proton irradiation on superconducting materials and related devices, Raman characterization and electrical transport measurement of 40-keV-proton irradiated YBa_2Cu_3O_(7-x)(YBCO) thin films are carried out. From micro-Raman spectroscopy and x-ray diffraction studies, the main component of proton-radiation-induced defects is found to be the partial transition of superconducting orthorhombic phase to the semiconducting tetragonal phase and non-superconducting secondary phase. The results indicate that the defects induced in the conducting CuO_2 planes, such as increased oxygen vacancies and interstitials, can result in an increase in the resistivity but a decrease in the transition temperature TCwith the increase in the fluence of proton irradiation, which is confirmed in the electrical transport measurements. Especially, zero-resistance temperature TC_0 is not observed at a fluence of 10^(15)p/cm^2.Furthermore, the variation of activation energy U_0 can be explained by the plastic-flux creep theory, which indicates that the plastic deformation and entanglement of vortices in a weakly pinned vortex liquid are caused by disorders of point-like defects. Point-like disorders are demonstrated to be the main contribution to the low-energy proton radiation damage in YBCO thin films. These disorders are likely to cause flux creep by thermally assisted flux flow, which may increase noise and reduce the precision of superconducting devices. 展开更多
关键词 SUPERCONDUCTORS PROTON radiation MICRO-RAMAN spectra electrical transport
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Variable optical chirality in atomic assisted microcavity
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作者 Hao Zhang Wen-Xiu Li +4 位作者 Peng Han xiao-Yang Chang Shuo Jiang An-Ping Huang zhi-song xiao 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第11期350-355,共6页
The manipulating of optical waves in a microcavity is essential to developing the integrated optical devices.Generally,the two eigenmodes in a whispering-gallery-mode(WGM)microcavity possess chiral symmetry.Here we sh... The manipulating of optical waves in a microcavity is essential to developing the integrated optical devices.Generally,the two eigenmodes in a whispering-gallery-mode(WGM)microcavity possess chiral symmetry.Here we show the chiral symmetry breaking is induced by the asymmetric backscattering of counter-propagating optical waves in a whisperinggallery-mode(WGM)microcavity with a cavity-made slot filled with atomic vapor.Through tuning the dispersion relation of the atomic vapor in the cavity-made slot,the chiral modes are continuously steered.The mode frequency splitting in the transmission and reflection spectra stem from the chiral symmetry breaking of the two eigenmodes.The displacement sensitivity of the proposed system in response to the length variation of cavity-made slot exhibits a high sensitivity value of 15.22 THz/nm. 展开更多
关键词 MICROCAVITY optical chirality DISPERSION
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Internal friction behavior of Ni_(50.5)Mni_(25)Ga_(24.5)alloy with cellular microstructure
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作者 Jun-Yi Liu Jing-Min Wang +2 位作者 Cheng-Bao Jiang Hui-Bin Xu zhi-song xiao 《Rare Metals》 SCIE EI CAS CSCD 2023年第5期1706-1711,共6页
Ni_(50.5)Mn_(25)Ga_(24.5)alloy with cellular microstructure was fabricated.The effect of the cellular microstructure on the internal friction(IF)behavior associated with martensitic transformation(MT),premartensitic t... Ni_(50.5)Mn_(25)Ga_(24.5)alloy with cellular microstructure was fabricated.The effect of the cellular microstructure on the internal friction(IF)behavior associated with martensitic transformation(MT),premartensitic transformation(PMT)and twin boundary motion(TBM)was investigated.Compared with conventional NiMn-Ga alloys,the temperature span of the IF_(MT)peak is significantly expanded,the IF_(PMT)is weakened,and no IF_(TBM)is detected.Both IF_(MT)and IF_(PMT)in the cellular microstructure exhibit unique frequency dispersion feature which has never been observed in conventional Ni-Mn-Ga alloys.The effect of point defects associated with the cellular microstructure is considered to understand the observed results. 展开更多
关键词 Martensitic transformations Internal friction MICROSTRUCTURE Point defects
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