| Magneto-resistance and vortex phase diagram of BaNi_（0.1）Fe_（1.9）As_2 single crystal |
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| 引用本文： | 鲁俊超,;于一,;皮雳,;张裕恒.Magneto-resistance and vortex phase diagram of BaNi_（0.1）Fe_（1.9）As_2 single crystal[J].中国物理 B,2014(12):444-448. |
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| 作者姓名： | 鲁俊超 ;于一 ;皮雳 ;张裕恒 |
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| 作者单位： | [1]College of Science, Henan University of Technology, Zhengzhou 450001, China; [2]School of Physics and Material Science, Anhui University, Hefei 230601, China; [3]High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei 230026, China |
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| 基金项目： | Project supported by the Foundation of Henan Educational Committee,China（Grant No.13B140951）; the Foundation of Henan University of Technology,China（Grant Nos.11JCYJ15 and 2011BS030） |
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| 摘 要： | The transition from vortex glass to a liquid phase is studied in Ba Ni0.1Fe1.9As2 single crystal with Tc = 19.4 K by magneto-resistance measurements. The resistivity curves are measured in magnetic fields in a range of 0 T–13 T for H‖c and H⊥c. Good scalings for all values of resistivity ρ（H, T） and the effective pinning potential U0（H, T） are obtained with the modified vortex glass theory by using the critical exponents s and H0. Phase diagrams for H‖c and H⊥c are determined based on the obtained vortex glass temperature Tg, the vortex dimensionality crossover temperature T＊, and the upper critical magnetic field Hc2. Our results suggest that both below and above 5 T, single vortex pinning co-exists with collective creep, and collective creep is dominant. There is a narrower vortex liquid region for H⊥c than for H‖c in the vortex phase diagram, which may originate from a stronger pinning force.
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| 关 键 词： | 涡流 相图 单晶 Fe 涡旋液体 临界磁场 钉扎力 电阻测量 |
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