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融熔织构YBa₂Cu₃O₇的电阻展宽

BROADENING OF RESISTANCE TRANSITION FOR MELT-TEXTURED YBa₂Cu₃O₇

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【Author】 Shi Kexing Zeng Zhaoyang Zhang Yitong Yu Zheng Ding Shiying Yao XixianPhysics Department and Solid State Microstructure Laboratory, Nanjing University, Nanjing 210008

【机构】南京大学物理系固体微结构实验室；南京大学物理系固体微结构实验室南京210008；南京210008；南京210008；

【摘要】测量了融熔织构 YBa₂Cu₃O₇在磁场中电阻转变的展宽效应.发现 R（T,H）=R₀exp[-U₀/k_BT],仍满足 Arrhenius 关系,钉扎能 U₀（H）仅为 eV 量级.讨论了影响 J_c 和磁通蠕动的因素.更多还原

【Abstract】 Broadening of resistance curve of Melt-Textured YBa2Cu3O7 sample in magnetic fields was measured. It was found that the broadening of resistance obeys Arrhe-nius relation, K(T,h) = R0exp( - U0/kBT), as single crystals. Flux pinning energy U0 is of magnitude of leV. Some factors that are relative to Jc are discussed.更多还原