强磁场诱导生长MgB_2超导体的磁各向异性研究  

FLUX JUMP IN THE MgB_2 fABRICATED IN A STRONG INDUCED MAGNETIC FIELD

作　　者：秦正平[1] 俞坚[1] 任树洋[2] 蔡传兵[1] 曹世勋[1] 任忠鸣[2] 张金仓[1] 

机构地区：[1]上海大学物理系,上海200444 [2]上海大学金属材料系,上海200444

出　　处：《低温物理学报》2009年第4期286-290,共5页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:10774097);教育部长江学者和创新团队发展计划(项目编号:IRT0739);上海市科基础研究重点项目(项目编号:07JC14022)资助的课题

摘　　要：通过磁场诱导技术,我们制备出具有织构化取向的MgB2超导体.样品X衍射图显示晶格参数发生变化,随着诱导磁场的增加晶格参数a逐渐递减;当诱导磁场达到10T将会导致晶格变形,影响晶粒尺度大小;分别对诱导磁场为2T、4T、6T、10T样品进行磁测量,可发现临界电流得到明显提高,并且不可逆场也有所提高,样品表现出磁各向异性.MgB2 superconductors with high performance were successfully fabricated through the magnetic field induction technology. The XRD of grown crystal demonstrate the lattice parameter changes, and the lattice parame- ter of a axis gradually decrease with increasing the induces the magnetic field. When the induces magnetic field a- chieve 10T, the crystal lattice is distorted, and the size of crystal grain decrease too. By the magnetic measurement of samples which induces the magnetic field is 2T, 4T, 6T and 10T respectively, we find that the critical current distinctly enhancement, and the irreversible field also enhancement. The samples display magnetic anisotropy.

关 键 词：晶体生长 MGB2 磁各向异性 

分 类 号：O511.4[理学—低温物理]