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Phase diagram and transport properties of Sb-doped Ca0.88La0.12Fe2As2 single crystals

Frontiers of physics 2017年第4期12卷 167-172页

作者： Xiang-Zhuo Xing Wei Zhou Chun-Qiang Xu Nan Zhou Fei-Fei Yuan Yu-Feng Zhang Xiao-Feng Xu Zhi-Xiang Shi Department of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 211189 China Department of Physics and Hangzhou Key Laboratory of Quantum Matters Hangzhou Normal University Hangzhou 310036 China

The effects of isovalent Sb substitution on the superconducting properties of the Ca0.88La0.12Fe2（As1-ySby）2 system have been studied through electrical resistivity measure- ments. It is seen that the antiferromagnetic or structural transition is suppressed with Sb content, and a high-To superconducting phase, accompanied by a low-Tc phase, emerges at 0.02 ≤y ≤ 0.06. In this intermediate-doping regime, normal-state transport shows non-Fermi-liquid-like behaviors with nearly T-linear resistivity above the high-Tc phase. With further Sb doping, this high-Tc phase abruptly vanishes for y 〉 0.06 and the conventional Fermi liquid is restored, while the low-T,, phase remains robust against Sb inlpurities. The coincidence of the high-Tc phase and non-Fermi liquid transport behaviors in the intermediate Sb-doping regime suggests that AFM fluctuations play an important role in the observed non-Fermi liquid behaviors, which may be intimately related to the unusual nonbulk high-Tc phase in this system.

关键词： Sb doped Ca0.88La0.12Fe2As2 superconductors electrical resistivity measurement phase diagram

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Evaluation method of rock damage under uniaxial compression based on unit series-parallel electrical conductive model

Rock Mechanics Bulletin

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Rock Mechanics Bulletin 2023年第4期2卷 18-26页

作者： Ganglie Yuan Ailan Che Youzhi Shi Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong University800 Dongchuan-RoadShanghai200240China School of Civil Engineering and Architecture Xiamen University of TechnologyXiamen361024China

The evaluation of rock damage behaviour is an important requirement for ensuring stability control and safety prediction in rock ***,they have not been able to obtain sufficiently accurate and dynamic results due to the insufficient evaluation *** this study,by means of fractals and unit series division,a unit series-parallel conductive model of damaged rock is derived,and a new evaluation method of rock damage under uniaxial compression was *** was damaged by uniaxial compression,while electrical measurements and X-ray microscopy tests were performed to obtain the damaged rock resistivity,porosity,and fractal dimension *** establishing the relationship between defined meso-damage factor and resistivity,rock damage evolution law under axial compression was *** results indicate that the growth trend was agree with the classical statistical damage model,which verified the accuracy of the results obtained by the proposed ***,as the strain increased,the damage factor determined by resistivity gradually decreased to0.06 firstly and then increased rapidly to *** from previous damage evolution law,brittle failure was observed and the cracks development in each stage was considered,including the closure(negative damage)and expansion(positive damage)of cracks.

关键词： Rock damage Uniaxial compression Unit series-parallel electrical resistivity measurement

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